Click Here -> Please Consider Making a PayPal Contribution to the FordSix Forum!
2019 Contributors:
NJwpod, 1strodeo, mightynorseman, maxtrux, 6d7coupe, broncr, Phase3, 68Flareside240, bmbm40,
mustang6, WorldChampGramp, justintendo, BigBlue94, ags290, motorsickle1130, Rooster, ousooner919, ethanperry
rzcrisis, DoctorC, jamyers, Motorboy, fastpat, Silverback280, chad


<<< New Site Update >>>

Transmission choices...

Moderator: Mod Squad

Mdixon300f100
Registered User
Posts: 161
Joined: Wed May 02, 2018 6:43 am

Transmission choices...

Post #1 by Mdixon300f100 » Tue Jun 18, 2019 7:11 pm

So in my parts gathering search I’ve come across a 1988 zf-s542 transmission out of a gas f250 for cheap. With final engine plans at about 600hp from a built turbo 240 I’m wondering if I should grab it. I know the stock srod trans is going to come apart when I goose it, but I’m torn on this, or waiting for a older cast iron t19 to turn up somewhere. If anyone can help me out I’d appreciate it, I’m kinda flying blind here.

Phase3
Registered User
Posts: 86
Joined: Fri Aug 31, 2018 9:34 pm
Location: Pittsburgh pa

Re: Transmission choices...

Post #2 by Phase3 » Tue Jun 18, 2019 8:51 pm

It may be possible to put the main shaft and counter shaft from the pre 95 diesel s5-42 into the gas s5-42 with the gas input shaft. This is a route i may be looking into for a turbo 240 also.
Side note the m5od is a great piece and as long as it is full if fluid, i havent seen any break from just a power standpoint.
1996 f150 turbo 4.9 OBD2 M5OD 4x4 12 lbs on 93
1997 f350 351w cclb

54-4x4
Registered User
Posts: 157
Joined: Tue Nov 25, 2008 11:51 pm
Location: Valemount,B.C.

Re: Transmission choices...

Post #3 by 54-4x4 » Tue Jun 18, 2019 9:57 pm

Mdixon300f100 wrote:So in my parts gathering search I’ve come across a 1988 zf-s542 transmission out of a gas f250 for cheap. With final engine plans at about 600hp from a built turbo 240 I’m wondering if I should grab it. I know the stock srod trans is going to come apart when I goose it, but I’m torn on this, or waiting for a older cast iron t19 to turn up somewhere. If anyone can help me out I’d appreciate it, I’m kinda flying blind here.

I don't know where you are at but I have a couple of 4 speed cast iron trannys,you can have one if you want and can pick it up.

Mdixon300f100
Registered User
Posts: 161
Joined: Wed May 02, 2018 6:43 am

Re: Transmission choices...

Post #4 by Mdixon300f100 » Wed Jun 19, 2019 5:28 am

54-4x4 wrote:
Mdixon300f100 wrote:So in my parts gathering search I’ve come across a 1988 zf-s542 transmission out of a gas f250 for cheap. With final engine plans at about 600hp from a built turbo 240 I’m wondering if I should grab it. I know the stock srod trans is going to come apart when I goose it, but I’m torn on this, or waiting for a older cast iron t19 to turn up somewhere. If anyone can help me out I’d appreciate it, I’m kinda flying blind here.

I don't know where you are at but I have a couple of 4 speed cast iron trannys,you can have one if you want and can pick it up.


I’m in connecticut

Mdixon300f100
Registered User
Posts: 161
Joined: Wed May 02, 2018 6:43 am

Re: Transmission choices...

Post #5 by Mdixon300f100 » Wed Jun 19, 2019 5:31 am

Phase3 wrote:It may be possible to put the main shaft and counter shaft from the pre 95 diesel s5-42 into the gas s5-42 with the gas input shaft. This is a route i may be looking into for a turbo 240 also.
Side note the m5od is a great piece and as long as it is full if fluid, i havent seen any break from just a power standpoint.


I’m about to get 2 f150 from a friend of mine, one 95, one 96 (used to be mine). Both have the m5od. I’m just not too trusting of the aluminum case, same thing that concerns me a dour the zf.

chero1369
Registered User
Posts: 85
Joined: Tue Dec 01, 2009 9:49 am
Location: slowdeatha,Tx

Re: Transmission choices...

Post #6 by chero1369 » Wed Jun 19, 2019 6:58 am

I know that 42 will handle 300 hp behind a 300.Beyond that you might want to source a top loader from behind a 427.BIG input/output shaft.I know it'll hold 1200 hp.

arse_sidewards
Registered User
Posts: 849
Joined: Mon Jan 21, 2013 7:18 am

Re: Transmission choices...

Post #7 by arse_sidewards » Wed Jun 19, 2019 7:47 am

As long as you don't clutch dump it wide open the 5-42 be fine but that would break any other transmission too. Transmissions generally have no problem taking more than they're "rated for" so long as you don't try and make them do it at the absolute lowest RPM. Considering your goal is 600hp and you certainly aren't doing that below 3k I don't think you will be much harder on the trans than a mildly built big block.

Seriously, break what you have before you spend a bunch of time and money trying to make something else work. You probably won't break what you have and you'll probably break a heck of a lot of drive shafts and axles before you break the ZF.
1994 F150 4x4 8ft, engine is basically stock.

66" leafs, extended radius arms, lockers in both ends, nothing special.

Mdixon300f100
Registered User
Posts: 161
Joined: Wed May 02, 2018 6:43 am

Re: Transmission choices...

Post #8 by Mdixon300f100 » Wed Jun 19, 2019 8:29 am

arse_sidewards wrote:As long as you don't clutch dump it wide open the 5-42 be fine but that would break any other transmission too. Transmissions generally have no problem taking more than they're "rated for" so long as you don't try and make them do it at the absolute lowest RPM. Considering your goal is 600hp and you certainly aren't doing that below 3k I don't think you will be much harder on the trans than a mildly built big block.

Seriously, break what you have before you spend a bunch of time and money trying to make something else work. You probably won't break what you have and you'll probably break a heck of a lot of drive shafts and axles before you break the ZF.


I don’t have the ZF. I have a T170 aluminum case that’s already ready to give up, lots of gear whine and it won’t hold first from a stop. I know the ZF is a hydraulic slave system, like the M5od, which I have a donor truck for all the pieces. I know because I put all new clutch master, slave, and lines in it 4yrs ago before it got parked. Including a new flywheel and 11” pressure plate.

Just so everyone’s clear, there’s no rush here.

Max_Effort
Registered User
Posts: 431
Joined: Sat Sep 29, 2018 12:26 pm

Re: Transmission choices...

Post #9 by Max_Effort » Wed Jun 19, 2019 9:48 am

The ZF is plenty tough. You want the gas engine version of course . It is physically big and it's a noisy box, and nothing you can do about the rattle.

There is a member on this site puttting big turbo power through an M5OD and it's holding up. I picked up a complete M5OD for my build, I'll have feedback about it eventually....

If you don't do anything stupid, and roll the power on, either trans should hold up.

User avatar
Shorty
Registered User
Posts: 115
Joined: Wed Dec 27, 2017 6:30 pm
Location: southern Ontario, Canada

Re: Transmission choices...

Post #10 by Shorty » Wed Jun 19, 2019 7:03 pm

the M50d has a very high reverse ratio, makes it hard to back up a trailer and could set land speed records in reverse. I have it in my 83 two wheel drive and like it better than the TOD four speed that it took the place of. The zf would have a lower ratio for reverse and first is a granny gear. All depends what the truck will be used for and if you want a close or wide ratio transmission.
85 F150 on 78 bronco frame C6 np205 welded dana44 front, trussed posi nine inch rear. EFI exhaust manifolds into one 2 1/2" rolls on 35x12.5x15 Maxxis Trepador.

Mdixon300f100
Registered User
Posts: 161
Joined: Wed May 02, 2018 6:43 am

Re: Transmission choices...

Post #11 by Mdixon300f100 » Wed Jun 19, 2019 8:12 pm

Shorty wrote:the M50d has a very high reverse ratio, makes it hard to back up a trailer and could set land speed records in reverse. I have it in my 83 two wheel drive and like it better than the TOD four speed that it took the place of. The zf would have a lower ratio for reverse and first is a granny gear. All depends what the truck will be used for and if you want a close or wide ratio transmission.


Basically for rolling burnouts at 70mph and destroying imports on the highway, it’s not a work truck. Being a base model 1980 f100 it’s pretty light. With a 2.75 rear, nothing is a granny gear. The ZF I’m looking at is 5.72 first, that’s what’s on the tag, which I believe it’s the wide ratio.

arse_sidewards
Registered User
Posts: 849
Joined: Mon Jan 21, 2013 7:18 am

Re: Transmission choices...

Post #12 by arse_sidewards » Thu Jun 20, 2019 8:39 am

An unloaded 1980 F100 is not going to be able to find enough traction to break any transmission you put in it.
1994 F150 4x4 8ft, engine is basically stock.

66" leafs, extended radius arms, lockers in both ends, nothing special.

sdiesel
Registered User
Posts: 743
Joined: Fri Jan 06, 2012 12:33 am
Location: NW Oregon,Buxton currently

Re: Transmission choices...

Post #13 by sdiesel » Thu Jun 20, 2019 11:59 am

honestly , gor fast boy toy, the zf is a poor choice. an automatic properly built seems a better option for ur needs.
my main complaint with the zf is slow shifting, and funky gear spreads

my choice might include an Aod, fully built.
they will take the power.

the zf will too, but that power with quick bang shifts is a recipe for dis aster
if u do go with ZF, get the quick throw shifting mechanism available for it.
replace front bearing b4 install.
which basically means a full rebuild.

zf cases are unobtainable now be careful with urs
Last edited by sdiesel on Thu Jun 20, 2019 1:17 pm, edited 1 time in total.
a long love affair with the 300 six.
my lastest and final fling is a fresh 300 in an 88 ford f350 dually 4X flatbed

guhfluh
Registered User
Posts: 419
Joined: Wed Jul 10, 2013 9:40 am

Re: Transmission choices...

Post #14 by guhfluh » Thu Jun 20, 2019 12:05 pm

600hp, 2.75 gear... I vote C6 :D

In a lightish truck, unless you plan on a lot of traction or really beating on it hard, I vote M5R2. The gear spacing in a ZF5 is good for towing, not for sporty driving.

You can also go with an AX15 with an adapter for good strength and gear spacing.

With 600hp from a 300, you will have more torque than any normal clutch will handle. You will need to look into something more custom. Something used behind high torque SBF Mustangs may work, but I'd call or email some clutch companies.

I beat on my T170 hoping it'll force me to upgrade one day from the bad 2-3 ratio bog, but even with high mileage, gear whines and random pieces that fell out when I changed the oil, it keeps on ticking just fine. I'm leaning towards a 6R80 swap, so the wife will finally drive it some.
1967 F-250 Crew Cab 2wd, 300 6cyl, T-170/RTS/TOD 4-speed overdrive
240 head, Offy C, EFI exhaust manifolds, Comp 268H, mandrel 2.5-3" exhaust, Edelbrock 500, Pertronix ignitor and coil, recurved dizzy. 200whp/300wtq

User avatar
THE FRENCHTOWN FLYER
VIP Member
Posts: 6093
Joined: Sat Nov 09, 2002 9:25 pm
Location: FRENCHTOWN

Re: Transmission choices...

Post #15 by THE FRENCHTOWN FLYER » Thu Jun 20, 2019 12:44 pm

Plus...with an auto, you can easily spool up the turbo from a dead stop.
FORD 300 INLINE SIX - THE BEST KEPT SECRET IN DRAG RACING

Mdixon300f100
Registered User
Posts: 161
Joined: Wed May 02, 2018 6:43 am

Re: Transmission choices...

Post #16 by Mdixon300f100 » Thu Jun 20, 2019 2:56 pm

THE FRENCHTOWN FLYER wrote:Plus...with an auto, you can easily spool up the turbo from a dead stop.


I personally despise automatics. I enjoy shifting, and I’m very good at it. Unfortunately I know I’m giving some things up with a manual, like keeping 2 hands on the wheel... :rolflmao:

If I planned on drag racing I would probably go auto, but the nearest strip is a couple hundred miles, either NH or NY. I’m still leaning toward a 4-speed based on speed/rpm calcs, I’ll be shifting out of second around 90mph

guhfluh
Registered User
Posts: 419
Joined: Wed Jul 10, 2013 9:40 am

Re: Transmission choices...

Post #17 by guhfluh » Thu Jun 20, 2019 3:47 pm

Mdixon300f100 wrote:I’m still leaning toward a 4-speed based on speed/rpm calcs, I’ll be shifting out of second around 90mph

That sounds horrible.
1967 F-250 Crew Cab 2wd, 300 6cyl, T-170/RTS/TOD 4-speed overdrive
240 head, Offy C, EFI exhaust manifolds, Comp 268H, mandrel 2.5-3" exhaust, Edelbrock 500, Pertronix ignitor and coil, recurved dizzy. 200whp/300wtq

Mdixon300f100
Registered User
Posts: 161
Joined: Wed May 02, 2018 6:43 am

Re: Transmission choices...

Post #18 by Mdixon300f100 » Thu Jun 20, 2019 3:56 pm

guhfluh wrote:
Mdixon300f100 wrote:I’m still leaning toward a 4-speed based on speed/rpm calcs, I’ll be shifting out of second around 90mph

That sounds horrible.


I already shift out of 1st at 40 with the stock engine and trans

arse_sidewards
Registered User
Posts: 849
Joined: Mon Jan 21, 2013 7:18 am

Re: Transmission choices...

Post #19 by arse_sidewards » Thu Jun 20, 2019 3:59 pm

guhfluh wrote:
Mdixon300f100 wrote:I’m still leaning toward a 4-speed based on speed/rpm calcs, I’ll be shifting out of second around 90mph

That sounds horrible.


~30" tires, 6000rpm and a 2.75 rear end will do that.

My 90s Subaru shifts out of 2nd at ~70mph and it has ~25" tires and 4.10s

These trucks came geared stupidly high from the factory (thanks EPA) so you get hilariously low cruising RPMs (and correspondingly high theoretical top speeds in low gears) unless you change that.
1994 F150 4x4 8ft, engine is basically stock.

66" leafs, extended radius arms, lockers in both ends, nothing special.

Mdixon300f100
Registered User
Posts: 161
Joined: Wed May 02, 2018 6:43 am

Re: Transmission choices...

Post #20 by Mdixon300f100 » Thu Jun 20, 2019 4:08 pm

arse_sidewards wrote:
guhfluh wrote:
Mdixon300f100 wrote:I’m still leaning toward a 4-speed based on speed/rpm calcs, I’ll be shifting out of second around 90mph

That sounds horrible.


~30" tires, 6000rpm and a 2.75 rear end will do that.

My 90s Subaru shifts out of 2nd at ~70mph and it has ~25" tires and 4.10s

These trucks came geared stupidly high from the factory (thanks EPA) so you get hilariously low cruising RPMs (and correspondingly high theoretical top speeds in low gears) unless you change that.


Yea, unfortunately it makes OD useless unless your going 80+mph. Downhill is fine, but I’m flat out any other time. Stock tires, different story I’m sure. I’m not sure if I want to change the rear gear, I know the higher the ratio, the stronger the ring and pinion teeth, but that stress has to go somewhere...

Mdixon300f100
Registered User
Posts: 161
Joined: Wed May 02, 2018 6:43 am

Re: Transmission choices...

Post #21 by Mdixon300f100 » Thu Jun 20, 2019 8:00 pm

I’m looking on Craigslist and there’s a c6 for $50... dammit :bang:

Max_Effort
Registered User
Posts: 431
Joined: Sat Sep 29, 2018 12:26 pm

Re: Transmission choices...

Post #22 by Max_Effort » Thu Jun 20, 2019 9:22 pm

Mdixon300f100 wrote:I’m looking on Craigslist and there’s a c6 for $50... dammit :bang:




Deals are out there. I picked up a good M5OD, complete with master, slave, line, shifter, almost New 11” clutch, flywheel, transfer case connecting housing for $100.

sdiesel
Registered User
Posts: 743
Joined: Fri Jan 06, 2012 12:33 am
Location: NW Oregon,Buxton currently

Re: Transmission choices...

Post #23 by sdiesel » Fri Jun 21, 2019 12:31 am

this whole subject is getting side-wards.
600 in front 2.75 in the rear, no weight on back axle....
yes o.d. is senseless.
there is a bell ringing in my head for a power glide 2 speed, with manual valve body.
I've never toyed with racer stuff, and never driven such a transmission, but with that kind of power and rear axle, the logic is there to suggest it

hehehe... or a lenco. jes sayin.
a long love affair with the 300 six.
my lastest and final fling is a fresh 300 in an 88 ford f350 dually 4X flatbed

Who is online

Users browsing this forum: No registered users and 23 guests