companion flange bolts

[monkeymissile]

Gents,
I need to replace all the companion flange bolts on the propeller shafts and just want to confirm that the total required is 8.
thanks!

[m37jarhead]

See TM 9-8031-2,
Pages 112 &118 for differential.
Pages 193, 198, 204, 205, 206, & 215 for the transfer case.
Pages 146, 156, & 171 for the transmission.
Might not hurt to replace the seals while you're in there.
Probably want to get grade 8 bolts (might be overkill) and new lock washers.
Torque spec's are in the TM.
Thread sealer would help prevent "weeping".
m37jarhead

[monkeymissile]

thanks, but perhaps I don't understand. Why do I need to replace seals when I'm just replacing a few questionable bolts that hold 2 flanges together? Flanges are fine, it just looks like someone replaced some of the bolts with junk ones.

[m37jarhead]

The companion flanges are at the end of shafts coming out of the transmission and the transfer case which, as you know,
attach to the propellar shafts. If the units are leaking/weeping oil you may want to replace the seals on these shafts. You'll have to remove the companion flanges to get at the seals. If new seals are not required and you only want to replace the
bolts, nuts and lock washers, that's an easy fix. Four bolts per flange. Again, check TM 9-8031-2, "Power Train, Body and Frame" for additional detail, torque values, spec's. etc. One companion flange on the tranny and four on the transfer case.
Hope that helps.

[monkeymissile]

The companion flanges are at the end of shafts coming out of the transmission and the transfer case which, as you know,
attach to the propellar shafts. If the units are leaking/weeping oil you may want to replace the seals on these shafts. You'll have to remove the companion flanges to get at the seals. If new seals are not required and you only want to replace the
bolts, nuts and lock washers, that's an easy fix. Four bolts per flange. Again, check TM 9-8031-2, "Power Train, Body and Frame" for additional detail, torque values, spec's. etc. One companion flange on the tranny and four on the transfer case.
Hope that helps.

thanks, will do

[Sal]

M/M Don't forget about the 8 on the shaft that's between the tranny and the transfer case.

Sal

[monkeymissile]

M/M Don't forget about the 8 on the shaft that's between the tranny and the transfer case.

Sal

thanks, looking through the manuals, I noted there are a lot more than 8 and some different lengths.

[Sal]

I had to replace all of mine. I found a lot of mis-matched bolts when I was replacing the universals on my truck.

Sal

[powerwagontim]

Different lengths? Unless we are all talking about different things, they were all the same on my truck. And there were 24 of them. Each driveshaft has a flange at each end, with 4 bolts per flange. Six flanges x 4 bolts = 24 bolts. Also, the bolts are special, although I cant recall what was special about them. I bought them in a military package, labeled "Driveshaft Flange Bolts" or something to that effect.
Tim

[MSeriesRebuild]

The companion flange bolts are splined, they are indeed a special bolt; and should be installed using crush type self locking nuts.

[monkeymissile]

Different lengths? Unless we are all talking about different things, they were all the same on my truck. And there were 24 of them. Each driveshaft has a flange at each end, with 4 bolts per flange. Six flanges x 4 bolts = 24 bolts. Also, the bolts are special, although I cant recall what was special about them. I bought them in a military package, labeled "Driveshaft Flange Bolts" or something to that effect.
Tim

I may have misread the parts list....

[M37UK]

The companion flange bolts are splined, they are indeed a special bolt; and should be installed using crush type self locking nuts.

How important is it that we use these splined bolts?
Are regular bolts with nyloc nuts sufficient?

[monkeymissile]

The companion flange bolts are splined, they are indeed a special bolt; and should be installed using crush type self locking nuts.

How important is it that we use these splined bolts?
Are regular bolts with nyloc nuts sufficient?

I think the splines keep the bolts from spinning and shearing off

[Cal_Gary]

I use standard grade 8 bolts on mine-never have had any problems.
Gary

[MSeriesRebuild]

The correct splined bolts make them much easier to handle as far as nut installation and removal. It has nothing whatever to do with keeping a bolt from shearing off.

Nylock nuts are simply a cheap excuse for self locking, must have protruding threads, and you can only use them once and toss them. There are 2 crush types that work great and can be reused in most cases. The cone style must have at least a couple of threads protruding in order to work. The center crush type actually lock at the center point of the nut allowing for flush mounting . The fact that no threads protrude stops the rust / paint issues in protruding threads that can can be very frustrating at removal time.