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Author Topic:   yoke length for 4 link
mod15r
Dirt Roller

Total posts: 10
posted October 10, 2004 09:24 AM  
converting car over to 4 link. what length yoke do i need? are there any factory long length yokes in the wrecking yard that will work? i am using a muncie 2 spd now.

dirtracer14
Dirt Forum Champ
Total posts: 1261
posted October 10, 2004 08:32 PM  
I can tell ya this...the muncie will only allow so much to come in the tail befor it runs out of spline. You need to set it up and check how much the driveshaft moves.

NJantz
Dirt Forum Champ
Total posts: 755
posted October 11, 2004 05:53 AM  
You'll want as much length as the transmission will allow. Take the springs out and cycle the suspension and you'll know for sure.

MIDWEST MOTORSPORTS
Dirt Full Roller

Total posts: 50
posted October 11, 2004 10:46 AM  
the muncies output shaft will need to be machined down so that the slip yoke can continue to travel forward. in some cases ppl machine out the splines on the inside of the yoke. either way it can be done, but most muncies have the wider shaft. thanks hope this helps.
you will need 2-2.5 inches of yoke sticking out of the tranny. with an xlt yoke from fastshafts, common lenghts are 28 3/4 for long pinion yokes and 29 3/4 for short pinion yokes.
those measurements are u joint to u joint with imca rules on wheelbase.

Dman
Dirt Freak

Total posts: 270
posted October 12, 2004 07:12 AM  
You can get a longer yoke from a late model GM pick-up with the 700r4 trans. Same size about 2 ins. longer. Splines and external size are the same.
Dman

CNC DOC
Dirt Full Roller

Total posts: 67
posted October 12, 2004 05:08 PM  
Midwest Motorsports, do you know the drive shaft length for a 4-link Harris with a Bert(not ballspline) transmission and a long wide yoke on the 9 inch gear? thanks

MIDWEST MOTORSPORTS
Dirt Full Roller

Total posts: 50
posted October 13, 2004 09:32 AM  
i apoligize but i do not know. sorry man, call reese at harris he will because he sold one when i was there. thanks
brett

andykmod
Dirt Freak

Total posts: 351
posted October 14, 2004 07:30 PM  
I think it's 28 center to center w/8 inch long slip yolk.Call Fast Shafts they will know,nice driveshafts also. The stock 700r4 yolks will work in any trans but the Falcon because of the tail shaft bearing,the yolk needs to be hardened.

[This message has been edited by andykmod (edited October 14, 2004).]

[This message has been edited by andykmod (edited October 14, 2004).]

mod15r
Dirt Roller

Total posts: 10
posted October 14, 2004 08:05 PM  
thanks for the info guys. i did not think about the splines on the trans being to short. i will have the main shaft turned down.

dluna
Dirt Freak

Total posts: 334
posted October 14, 2004 11:23 PM  
andykmod -

Can you explain a little more about the falcon tailshaft?

I put a brand new 8" yoke in our car running a falcon tranny. After the second night on it, I noticed a small grove on the yoke that went about 3/4 of the way around the shaft. Is the tailshaft poorly designed?

NJantz
Dirt Forum Champ
Total posts: 755
posted October 15, 2004 12:06 PM  
Nothing wrong with the falcon tail shaft design. It has a roller bearing back there for the yoke to ride in. You just need a hardened slip yoke so it doesn't wear out too fast where the bearing rides. Some of the yokes(non hardened) out there are only really compatible with a bushing. The Falcon requires a yoke with a hardened surface so the roller bearing won't wear the yoke out as fast.

andykmod
Dirt Freak

Total posts: 351
posted October 15, 2004 01:58 PM  
You got'er NJantz.

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