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Author Topic:   Driveshaft length
dirtbandit
Dirt Maniac

Total posts: 110
posted August 29, 2005 05:58 AM  
What is the best method for measuring driveshaft length and determining which yoke to use? I am finally getting my car complete and only want to do this once.....lol
Thanks in advance for your help.

-Dirtbandit

Xtreme12x
Dirt Forum Champ
Total posts: 874
posted August 29, 2005 07:49 AM  
What I like to do is set the rear suspention up the way the manufacture wants you to, and then from there adjust your trailing arms on the left side for maximum rear steer, same thing on the right side and them put in a slip yolk leaving about 1 1/2 inches hanging out of yolk, and then measure center to center and there you have it. We have never had a problem on 2 link, 4 link, swingarm cars with driveshaft lenght measuring like this.

dirtbandit
Dirt Maniac

Total posts: 110
posted August 29, 2005 11:13 AM  
How about yoke length on the transmission. Is there a rule of thumb for a 4 bar car? Should I be getting the longest yoke (8" ) or will a shorter one suffice?

-Dirtbandit

dirtywrench13
Dirt Freak

Total posts: 324
posted August 29, 2005 11:58 AM  
JUST GET THE 8* ONE AND DON'T WORRY TOO MUCH, THEY USE THE PRECISION #369 JOINT JUST LIKE THE MOST COMMON SHAFTS DO ALSO.

TEAMPCR
Dirt Freak

Total posts: 238
posted September 02, 2005 06:08 AM  
If you go with the long yoke, make sure the tail shaft on the trans is splined far enough to take the yoke. If it is not, the long yoke will "bottom out", and do you no good. Dave

doghouse racing4
Dirt Forum Racer

Total posts: 91
posted September 02, 2005 08:51 AM  
I run a saginaw 3 speed. Would like to run the long yoke but have heard and seen that the yoke will only go into the tail shaft about half way before it bottoms out. Is there a way to fix this? Or is it, you just can't run a long yoke with a saginaw?

vosevichs
Dirt Forum Racer

Total posts: 78
posted September 02, 2005 11:25 AM  
Doghouse,
Yes there is. we just did ours last week. Remove the tailshaft housing. Be carefull There is a snap ring thet you have to get too after you seperate about a 1/2 in. Then Pull the housing off. Then you can grind down the tailshaft after the splines so the longer yoke will slide on. We Removed the side plate with the shifter forks and pull the tail shaft all the way out. All your gears will come with. There is a idler gear that we had to remove the snap ring to let it slide forward. There are some bearings that will fall out of the input shaft where thew 2 shafts meet. Then we machined the shaft down. Either way works. Just be careful if you use a grinder. When reassembleing use some grease to hold the bearings in place and when you slide the assembly in there are 3 notches in the syncros at the end of the output shaft and on the end o the input shaft that need to be alinged. If it don't look like it's going in far enough just spin the shaft a bit and it should drop in.

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Scott Vosevich
RDBoyz Racing

doghouse racing4
Dirt Forum Racer

Total posts: 91
posted September 02, 2005 03:15 PM  
thanks Vosevich!!!!!!!!!!!!!!!

doghouse racing4
Dirt Forum Racer

Total posts: 91
posted September 02, 2005 03:20 PM  
Am going to try a 4/2 set up from a 3 link. What is the Min. length/distance I need from the yoke to the trans tail shaft?? Some say 1 1/2" other say from 2 to 3 1/4". Whats the min. I can have?

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