93 Ford F150 Tranny Swap

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93 Ford F150 Tranny Swap

Postby Susmark1 » Thu Dec 06, 2012 8:24 pm

Let me begin by saying that I am brand new in forum but have been doing some reading on here for a while... There is definately some good info!

Currently I have a 93 F150 4x4 with a 300 fuel injected and a 4 speed T18. The gears in rear are 3.55's. I do a lot of highway driving and the 75mph speed limit really is pushing the engine rpm's. Will replacing the tranny with a ZF or NV 4500 lower the rpms enough to gain any fuel mileage? I know the swap is not that cheap especially the NV swap. I appreciate the help!
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Re: 93 Ford F150 Tranny Swap

Postby 80broncoman » Thu Dec 06, 2012 10:57 pm

Do you really need the 3.55 gears??? if you running close to stock height tires I'd think 3.08 gears would work much better for MPG.
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Re: 93 Ford F150 Tranny Swap

Postby StrangeRanger » Thu Dec 06, 2012 11:19 pm

To answer the simplest question: unless you get most of the parts for free, there is no tranny swap or gear swap that will pay for itself in fuel mileage.

What tranny was in your 93 originally and how did it end up with a T-18?
1996 F-150 (tow missile)
1993 Mustang 5.0 (hot rod and auto-x monster)
1982 Tiga Formula Ford (SCCA racecar)
2006 Mazda 6i (daily driver)
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Re: 93 Ford F150 Tranny Swap

Postby Susmark1 » Fri Dec 07, 2012 2:18 am

I don't know what was in it orginally. Traded a couple of guns for the truck and it was in it when I traded for it.
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Re: 93 Ford F150 Tranny Swap

Postby Susmark1 » Fri Dec 07, 2012 10:22 am

as far as tires, I am running 31's on it and if it cost me some money to get it to run down the highway better, thats ok.
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Re: 93 Ford F150 Tranny Swap

Postby Harte3 » Fri Dec 07, 2012 1:53 pm

Back off on your hwy speed to say 62-65 mph and you will get some increase in mpg. Just because the speed limit is 75 mph, nothing says one has to drive at that speed.
'83 F150 300, 0.030 over, Offy DP, Holley 4160/1848-1 465 cfm, Comp Cam 260H. P/P head, EFI exhaust manifolds, Walker Y Pipe, Super Cat, Turbo muffler, Recurved DSII, Mallory HyFire 6a, ACCEL Super Stock Coil, Taylor 8mm Wires, EFI plugs.
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Re: 93 Ford F150 Tranny Swap

Postby MechRick » Fri Dec 07, 2012 2:21 pm

If that T18 has a granny gear, you can switch the gear ratios to 3.08's.

I put a ZF in mine to set it up for towing. You will need the hydraulic line and master from the donor truck (different style hydraulic line). The trans crossmember will have to be relocated and notched. I used a C6 rear mount (lower to make up for the difference in frame heights). Front driveshaft will have to be lengthened, the rear shortened a couple of inches. Transfer case bolts right up.
1994 F150, 4.9L/ZF 5 speed, C-Vic police driveshaft
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1996 long block with stock hyper pistons, ARP rod bolts
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Re: 93 Ford F150 Tranny Swap

Postby THE FRENCHTOWN FLYER » Fri Dec 07, 2012 2:34 pm

Harte3 wrote:Back off on your hwy speed to say 62-65 mph and you will get some increase in mpg. Just because the speed limit is 75 mph, nothing says one has to drive at that speed.

x2
and keep an eye on tire pressures.
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Re: 93 Ford F150 Tranny Swap

Postby Susmark1 » Fri Dec 07, 2012 5:19 pm

I would like to put the ZF in. I think it might work out great. I would do all the work myself as I have a small machine shop in the garage (lathe, welder, vertical mill etc...)
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Re: 93 Ford F150 Tranny Swap

Postby MechRick » Fri Dec 07, 2012 8:26 pm

I would do all the work myself as I have a small machine shop in the garage (lathe, welder, vertical mill etc...

I'm envious. I sold my vertical mill two years ago and have always wanted a nice metal lathe.

Should be a piece of cake for you. I welded up my own shafts, got them within .010" runout without a lathe, but it was a lot of work. You just need to find an F250/F350 4x4 ZF from a 5.8/5.0/4.9L truck and you are golden...
1994 F150, 4.9L/ZF 5 speed, C-Vic police driveshaft
EFI head w/mild port work, 3 angle valve job
1996 long block with stock hyper pistons, ARP rod bolts
Stock speed density PCM
Stock cam installed straight up (aluminum cam gear)
Hedman header, full mandrel bent duals, crossover, super turbos
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Re: 93 Ford F150 Tranny Swap

Postby Susmark1 » Fri Dec 07, 2012 9:19 pm

Well the only reason I have those tools is to build guns but they sure come in handy when you need them. I am going to start looking and get the parts together. I sure appreciate the help!
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Re: 93 Ford F150 Tranny Swap

Postby Susmark1 » Fri Dec 07, 2012 9:20 pm

.010 without a lathe is really good!
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Re: 93 Ford F150 Tranny Swap

Postby tom954x4 » Sun Dec 09, 2012 4:22 pm

like what Harte 3, if you drive 75 your mileage will suffer even if you change trannys or gear ratio. Wind resistance at 75 mhp is more than double the resistance at 50 mph. This is a big deal in a aero brick like a 93 F-150.
1995 F-150, 300-6, 4x4, ex-cab, sb, 3.08 5-speed, 2 1/2 in. exhaust w/flowmaster 50, MSD + ignition upgrades, canopy, 171,000 + miles Gone but not forgotten: 1965 F-100 240 3spd lwb "the green hornet"; 1991 f-150 300 5sp 2wd sb, 1960 F-250 4x4, 223 six, 4sp with wrap-around rear window, two-tone paint.
Tow vehicle: 2012 F-250 4x4 6.7 diesel XLT s/c lwb 20+mpg
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