Too much torque

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charged225

charged225

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Hey guys,

My turbo /6 has too much torque. Busted my yolk and u joint lol

Not complaining but I need some help, are the splines on a late model v8 the same? What I need is a stronger yolk and u joint that I can pick from the junk yard.

Plz help a young gun out. My car will be in car craft mag soon and I need to get this done before the spring fling in van nuys (mothers day).
 
I've heard most 4 speed trans are 727 style yolk which you can likely get a bigger u joint yolk. Some did have 904 style yolks though. But you might be able to get a bigger U joint yolk for that out of a truck or van.

Looking online, 904 is a 25/26 spline count and 727 is 29/30 spline count.


Hope this helps a bit, someone here probably can tell you a bit more about what to get.
 
SirDan said:
I've heard most 4 speed trans are 727 style yolk which you can likely get a bigger u joint yolk. Some did have 904 style yolks though. But you might be able to get a bigger U joint yolk for that out of a truck or van.

Looking online, 904 is a 25/26 spline count and 727 is 29/30 spline count.


Hope this helps a bit, someone here probably can tell you a bit more about what to get.
Click to expand...

I think what I am going to do is go with a 2.5 ton old military surplus ujoint. You're right when you say the yolk is almost the same. When guys took a /6 and dropped a v8 they used the same yolk and ujoint. Why mine broke is beyond me lol
 
Most factory 4 speed cars have a larger u-joint/yokes than the 727 auto cars with the acceptation of Hemi and some others, but the splines are the same. Why yours broke could be age, bad part, or abuse. The u-joint breaking and high rpm could have just wiped out the yoke, the yoke may not of failed but was ruined in the wake.

There are other ways to control the torque with the turbo by tapering or controlling the boost.
 
I would say you had a wore out 7260 set up, small joint.
A 7290 is a step up, you will need new trans yoke, driveshaft, and rear end yoke.
1350 is bigger yet aftermarket.

You can run offset sizes on the yokes and driveshafts but I do not recommend it.

If your driveshaft and yoke is in good shape buy a quality u-joints and put it back together, no autozone or chain store stuff, look for spicer u-joints.

Here is a link to find out what you have in it now.

http://www.brewersperformance.com/products.asp?cat=121
 
You may also want to look into your pinion angle. I've run 500pound feet of torque thru the small joint/yoke before with no issues. Right now there's a larger joint 4sp/dana combo in a heavier car making close 600tq. So you might want to look into driveline angles and how the rear moves when you drop the clutch or shift hard. If the rear rotates too far "up" the joint binds and things break.
 
I've broken std u-joints behind stock slants...What clutch are you running? My turbo /6 annihilated the 10.5 B&B clutch. I went to a bronze puck style disk and started breaking stuff from the chatter...or maybe it's the way I drive. Congrats on the turbo AND the magazine article, VERY cool indeed.
 
player1up said:
I've broken std u-joints behind stock slants...What clutch are you running? My turbo /6 annihilated the 10.5 B&B clutch. I went to a bronze puck style disk and started breaking stuff from the chatter...or maybe it's the way I drive. Congrats on the turbo AND the magazine article, VERY cool indeed.
Click to expand...

I had to run a custom made dual disk from gerko enterprises. hes going to be at the Spring Fling Mopar show and my Duster will be in his booth. Are you running Efi in your duster? yea i never even ran the stock 10 1/2 i went with the 10 in borg and beck. that lasted a month lol but i obviously put heavy duty springs and everything. I had it done by clutchmasters in SoCal and it was supposed to handle my car but it didnt. I am not saying my car is super tuned to extreme performance actually its quite opposite. the idea behind mine is 500 dollars in the motor will get you to beat stock mustangs and vettes while still getting 20mpg because its my daily driver. I am however starting to build annother /6 motor with a big cam, ball bearing turbo around 60mm or bigger that will push upwards of 20 pounds. :finga:
 
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