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#1
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TH-400 help
What do I have- it appears to be a BOP TH-400, but the output yoke is bolted in... what gives?
Can a regular slip yoke be used?
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John IG: @crawdaddycustoms YouTube: https://www.youtube.com/channel/UCK9...Nc_lk1Q/videos |
#2
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403 Olds, but yes, you can use a slip yoke. There are some specifics that elude me, but the one you need doesn't have splines running the entire length (because the truck output shaft uses an o-ring)
OPH knows, I'm pretty sure it was his posts I gleaned that info from |
#3
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Quote:
Quote:
If you don't use the O-ring, the vented yoke will piddle trans fluid. Gotta have a sealed yoke, and an output shaft with a missing spline. The missing spline becomes the vent for the yoke, but it vents internal to the trans, so no fluid loss. So I think those are your two choices: Either you have an O-ring on the output shaft and a vented yoke; or you have a missing spline on the output shaft, and a non-vented yoke. I don't know how the bolted-yoke output shaft is set up. |
#4
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Truck TH400. Yes you can remove the bolt & Yoke then use a sealed slippy Yoke.
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#5
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Ok, thanks for the info... By sealed, you are referring to a standard TH-400 yoke, yes?
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John IG: @crawdaddycustoms YouTube: https://www.youtube.com/channel/UCK9...Nc_lk1Q/videos |
#6
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I'm curious ... what was the reason for having it bolt on? I assume there was some sort of sliding shaft downstream?
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#7
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Yep. A 70s crew cab needed almost nine(!) feet worth of driveshaft. So they used two driveshafts, with a crossmember mounted steady bearing and a slip yoke in the middle. Well, closer to the front, but you get the idea...
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#8
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I guess it's a "truck" model- maybe a GMC product w/ an Olds 403- that GM decided to bolt the yoke in place and have a slip section in the driveshaft...
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John IG: @crawdaddycustoms YouTube: https://www.youtube.com/channel/UCK9...Nc_lk1Q/videos |
#9
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It may have been form a late 1970's diesel truck
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The difference between inlaws and outlaws? Outlaws are wanted |
#10
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Jaguar TH400's had a bolt in yoke with round flange.
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#11
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I've got a couple of TH400's here in the shop with a bolt on yoke. The are Chevy truck cores. I've seen a few others over the years but can't remember if any were BOP, I was thinking all the ones with a bolt on yoke I've done had Chevy cases.........Cliff
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If you can read this, thank a teacher. If you can read this in English, thank a Veteran! https://cliffshighperformance.com/ 73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile), |
#12
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Probably Olds diesel in a GMC like stated earlier. I always put the shaft in a lathe and cut down the o-ring bulkhead so a regular yoke works.
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1964 GTO 501, Edelbrock Heads NA, 3460 lbs. 9.76 @ 137mph 1971 Trans Am Lucy Blue, 11.56 @ 115 1966 LeMans. 462, SD prepped Kaufman D ports. 11.90 @ 112 1976 Trans Am twin turbo 462, SD Edelbrock heads 8.50@159 2009 G8 GT |
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