T-400 to 4L60E swap - yoke & drive shaft? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 11-03-2009, 03:48 PM
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T-400 to 4L60E swap - yoke & drive shaft?

howdy,

I'm contemplating swapping the carb'ed 454 out of my old 2500 suburban for a 5.3L w/ the 4L60E.
One question I have pertains to the drive shaft & yoke.
on the 454 TH400 combo I have a 2-piece drive shaft which includes fixed yokes (not sliding, both bolted to pinion & transoutput) at both the rear and trans ends, a center support bearing, and an intermediate sliding yoke just aft of the support bearing.
The 4L60E is pretty typical with the sliding yoke style at the trans.

any recommendations how I would work this out? Convert my current 2-piece drive shaft to sliding at the trans using the 4L60E yoke? the center support bearing is pressed onto the 1st shaft and then bolt in place with a cross member so it would *seem* like it would retain the shafts w/o movement at the trans.
I'd end up using this truck to tow with, so I need to make sure the system isn't weak nor will it fallout while in use!

thanks,
Morgan

Last edited by y5e06; 11-03-2009 at 04:20 PM.
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Old 11-03-2009, 04:33 PM
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howdy there well one piece 27 spline shaft will be needed and is pretty common

and any old surburban 700r4 one should work fine, rom the same year body group style as yours

whatever it is

91 older old body
or 92 up new body

they may not even have changed the wheelbase length on these in 92

im not sure..
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Old 11-03-2009, 05:03 PM
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If it was me, I would put a slip yoke on the front section and adjust the length if needed and reuse the 2 pc Driveline. If you give me the size of your front u-joint I can give you the part number for the slip yoke.

If any length adjustment is needed it will be just the front section. If you go that way make sure and take both sections of the driveline so the shop can balance the 2 sections together.
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Old 11-03-2009, 05:24 PM
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I was thinking of staying away from the loooooonnngg 1-piece drive shafts if possible. so I suppose modifying mine w/ the proper yoke is what I was wondering about.
I *think* mine is a 1350 u-joint.

so it looks like I'd need the proper 4l60E slip yoke at the trans for 1350 U-Joint, then have my 1st shaft shortened appropriately, and both 1st & 2nd shaft balanced?

I JUST put new u-joints & carrier bearing in, so would be nice to save a few pennies there.
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Old 11-03-2009, 05:55 PM
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Quote:
Originally Posted by y5e06
I was thinking of staying away from the loooooonnngg 1-piece drive shafts if possible. so I suppose modifying mine w/ the proper yoke is what I was wondering about.
I *think* mine is a 1350 u-joint.

so it looks like I'd need the proper 4l60E slip yoke at the trans for 1350 U-Joint, then have my 1st shaft shortened appropriately, and both 1st & 2nd shaft balanced?

I JUST put new u-joints & carrier bearing in, so would be nice to save a few pennies there.
Good choice! Yes you're correct. 1350 slip yoke is Spicer#3-3-4281X.
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Old 11-03-2009, 06:25 PM
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thanks for the info.
so to approach from an another angle, is there a simple way to add a fixed yoke to a 4L60E? Or is a slip yoke the only way to go? I do not know if the trans output shaft is threaded, but if it were, are there appropriate bolt-in fix yokes that would easily fit?
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Old 11-03-2009, 06:47 PM
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Way easier to just get a slip yoke and be done with it.
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