8" rear in my L6 65 Ranchero

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StarDiero75
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8" rear in my L6 65 Ranchero

Post #1 by StarDiero75 » Sat Oct 07, 2017 6:55 pm

Howdy guys,

So I bought an 8" rear end and got the driveshaft fitted for it and all and I'm hearing this thing about pinion angle. The rear came out of a 66 Mustang, so should it be literally bolt up or does the angle angle need to be adjusted?
My car has a stock 200 and the 3spd manual.
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bubba22349
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Re: 8" rear in my L6 65 Ranchero

Post #2 by bubba22349 » Sat Oct 07, 2017 9:21 pm

The short answer is yes maybe. The only way to know for sure is to measure the front and rear driveshaft angles with an angle gauge to see if it's within specs. If everything is still stock it also maybe ok. Can't tell the angle of your front U Joint, the picture of rear U Joint looks like the pinion angle might be a little high. In the picture is car setting with all tires down (the suspention loaded) and on level ground? Good luck when you drive it check for any vibrations. :nod:
A bad day Drag Racing is still better than a good day at work!

I am still hunting for a project car to build but with my current low budget it's not looking so good. My Ex- Fleet of Sixes these are all long gone! :bang: 1954 Customline 223 3 speed with O/D, 1963 Fairlane project drag car with BB6, 1977 Maverick 250 with C4, 1994 F-150 a 300 with 5 speed.

StarDiero75
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Re: 8" rear in my L6 65 Ranchero

Post #3 by StarDiero75 » Sat Oct 07, 2017 11:16 pm

bubba22349 wrote:The short answer is yes maybe. The only way to know for sure is to measure the front and rear driveshaft angles with an angle gauge to see if it's within specs. If everything is still stock it also maybe ok. Can't tell the angle of your front U Joint, the picture of rear U Joint looks like the pinion angle might be a little high. In the picture is car setting with all tires down (the suspention loaded) and on level ground? Good luck when you drive it check for any vibrations. :nod:

Yes, all the tires are on the ground and the floor is flat. Can I get an angle gauge at NAPA or something?Also what should the angles be between? Where can I get it adjusted?

Thanks

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bubba22349
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Re: 8" rear in my L6 65 Ranchero

Post #4 by bubba22349 » Sun Oct 08, 2017 1:08 am

An example of an angle gauge is in the link below, yes you can find them many places like NAPA, Home Depot, Harbor Freight, etc. https://www.summitracing.com/int/parts/ ... suspension

Measureing the angles is fairly easy follow directions in below link and watch the video for tips too. Good luck :nod:

http://www.hotrodhotline.com/md/html/dr ... monics.php

Video

https://m.youtube.com/watch?v=d1VSyvLD55c
A bad day Drag Racing is still better than a good day at work!

I am still hunting for a project car to build but with my current low budget it's not looking so good. My Ex- Fleet of Sixes these are all long gone! :bang: 1954 Customline 223 3 speed with O/D, 1963 Fairlane project drag car with BB6, 1977 Maverick 250 with C4, 1994 F-150 a 300 with 5 speed.

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chad
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Re: 8" rear in my L6 65 Ranchero

Post #5 by chad » Sun Oct 08, 2017 9:31 am

I believe the correction (if beyond 5 - 8*?) are wege shaped shims of correct angle) @ leaf springs/rear axel tube contact area ('perch").
Not such a big deal. Findin the spec & measuring the rig is the tougher part...

Does it vibrate now?
"Big thing is only make one change at a time. Change 2 or more things at a time it becomes difficult to figure which change helped or hurt" turbo2256b » 1/16/2017
Chad - '70 LUEB on '77 frame (i.e. PS, D44, trapezoidal BB 9", 4.11), 250, NV 3550 & DSII to B transplanted, "T" D20/PTO, 2" SL, 1" BL, 4 discs, 33"X15", etc. Seeking: Hydraulic gear motor for Koenig pto. chrlsful@aol.com (413) 259-1749

StarDiero75
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Re: 8" rear in my L6 65 Ranchero

Post #6 by StarDiero75 » Mon Oct 09, 2017 3:12 am

chad wrote:I believe the correction (if beyond 5 - 8*?) are wege shaped shims of correct angle) @ leaf springs/rear axel tube contact area ('perch").
Not such a big deal. Findin the spec & measuring the rig is the tougher part...

Does it vibrate now?

Yeah it vibrates, I just took it out for the first time today. I had it up to 40 and it only vibrated on deceleration at around 25 and below to 15. Is this something I should probably take to a rear end guy to set? What should something like that cost?

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Re: 8" rear in my L6 65 Ranchero

Post #7 by drag-200stang » Mon Oct 09, 2017 9:51 am

Try taking out the the drive shaft, turning it 180 and reinstall..Make sure that no pins are are out of place in the caps..make sure that the joint is in the yoke correctly and the u bolts are not over tight, it is easy to over tighten them.
66 Mustang Coupe
200 turbo w/lenco 4-spd
stock adj. rockers, stock timing set, ARP studs
best 1/4 mile ET 9.85/best mph 139 on 8 lbs progressing to 15 lbs boost
Went 9's when 10's was fast.

StarDiero75
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Re: 8" rear in my L6 65 Ranchero

Post #8 by StarDiero75 » Mon Oct 09, 2017 1:11 pm

drag-200stang wrote:Try taking out the the drive shaft, turning it 180 and reinstall..Make sure that no pins are are out of place in the caps..make sure that the joint is in the yoke correctly and the u bolts are not over tight, it is easy to over tighten them.

Alright, how tight should they be?

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Re: 8" rear in my L6 65 Ranchero

Post #9 by wsa111 » Mon Oct 09, 2017 7:11 pm

Did you have your driveshaft balanced?? Do that if rotating shaft 180" does not help. Then go after pinion angle if vibration still occurs.
Nice detailing on the hog head with glyptal red paint.
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drag-200stang
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Re: 8" rear in my L6 65 Ranchero

Post #10 by drag-200stang » Tue Oct 10, 2017 10:25 am

StarDiero75 wrote:
drag-200stang wrote:Try taking out the the drive shaft, turning it 180 and reinstall..Make sure that no pins are are out of place in the caps..make sure that the joint is in the yoke correctly and the u bolts are not over tight, it is easy to over tighten them.

Alright, how tight should they be?

Tight enough to stay tight and not so tight that the bearings get pinched...About 14-17 FT/LBS.
66 Mustang Coupe
200 turbo w/lenco 4-spd
stock adj. rockers, stock timing set, ARP studs
best 1/4 mile ET 9.85/best mph 139 on 8 lbs progressing to 15 lbs boost
Went 9's when 10's was fast.

StarDiero75
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Re: 8" rear in my L6 65 Ranchero

Post #11 by StarDiero75 » Tue Oct 10, 2017 6:24 pm

wsa111 wrote:Did you have your driveshaft balanced?? Do that if rotating shaft 180" does not help. Then go after pinion angle if vibration still occurs.
Nice detailing on the hog head with glyptal red paint.

I had the driveshaft balanced when I got the yoke changed over.
Thanks man. I actually bought it like that. The guy even chromed the whole rear end, not my taste but it was cheap and rebuilt. I would've done flat black.
I actually put the shims in yesterday for the pinion angle. It's 4 degrees negative now. It vibrates a little when decelerating from about 24 to 20 but otherwise smooth. It feels a lot nicer with the -4 ° wedge. Flipping the driveshaft could fix that?

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chad
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Re: 8" rear in my L6 65 Ranchero

Post #12 by chad » Tue Oct 10, 2017 6:39 pm

"Flipping the driveshaft could fix that?"
...only 1 way.
"Big thing is only make one change at a time. Change 2 or more things at a time it becomes difficult to figure which change helped or hurt" turbo2256b » 1/16/2017
Chad - '70 LUEB on '77 frame (i.e. PS, D44, trapezoidal BB 9", 4.11), 250, NV 3550 & DSII to B transplanted, "T" D20/PTO, 2" SL, 1" BL, 4 discs, 33"X15", etc. Seeking: Hydraulic gear motor for Koenig pto. chrlsful@aol.com (413) 259-1749

StarDiero75
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Re: 8" rear in my L6 65 Ranchero

Post #13 by StarDiero75 » Tue Oct 10, 2017 9:41 pm

chad wrote:"Flipping the driveshaft could fix that?"
...only 1 way.

True that.

drag-200stang
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Re: 8" rear in my L6 65 Ranchero

Post #14 by drag-200stang » Tue Oct 10, 2017 10:11 pm

StarDiero75 wrote:
wsa111 wrote:Did you have your driveshaft balanced?? Do that if rotating shaft 180" does not help. Then go after pinion angle if vibration still occurs.
Nice detailing on the hog head with glyptal red paint.

I had the driveshaft balanced when I got the yoke changed over.
Thanks man. I actually bought it like that. The guy even chromed the whole rear end, not my taste but it was cheap and rebuilt. I would've done flat black.
I actually put the shims in yesterday for the pinion angle. It's 4 degrees negative now. It vibrates a little when decelerating from about 24 to 20 but otherwise smooth. It feels a lot nicer with the -4 ° wedge. Flipping the driveshaft could fix that?

I meant turn the drive shaft 180 or rear yoke if that is easier, not end for end. That would be a lot of work...Parts are not made perfect, if the drive shaft is out some and the pinion yoke is off the same way , it will be double out. If you rotate 180 the offs can sometimes cancel each other ...You just have to try it to see, may be worse...But it will give you an opportunity to check the u joint bearing and bolts.
Last edited by drag-200stang on Tue Oct 10, 2017 10:19 pm, edited 2 times in total.
66 Mustang Coupe
200 turbo w/lenco 4-spd
stock adj. rockers, stock timing set, ARP studs
best 1/4 mile ET 9.85/best mph 139 on 8 lbs progressing to 15 lbs boost
Went 9's when 10's was fast.

StarDiero75
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Posts: 34
Joined: Tue Jun 13, 2017 9:39 pm

Re: 8" rear in my L6 65 Ranchero

Post #15 by StarDiero75 » Tue Oct 10, 2017 11:54 pm

drag-200stang wrote:
StarDiero75 wrote:
wsa111 wrote:Did you have your driveshaft balanced?? Do that if rotating shaft 180" does not help. Then go after pinion angle if vibration still occurs.
Nice detailing on the hog head with glyptal red paint.

I had the driveshaft balanced when I got the yoke changed over.
Thanks man. I actually bought it like that. The guy even chromed the whole rear end, not my taste but it was cheap and rebuilt. I would've done flat black.
I actually put the shims in yesterday for the pinion angle. It's 4 degrees negative now. It vibrates a little when decelerating from about 24 to 20 but otherwise smooth. It feels a lot nicer with the -4 ° wedge. Flipping the driveshaft could fix that?

I meant turn the drive shaft 180 or rear yoke if that is easier, not end for end. That would be a lot of work...Parts are not made perfect, if the drive shaft is out some and the pinion yoke is off the same way , it will be double out. If you rotate 180 the offs can sometimes cancel each other ...You just have to try it to see, may be worse...But it will give you an opportunity to check the u joint bearing and bolts.

Sorry I meant spinning it. I'll be trying that tomorrow.

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