Real time ahelp SM420 swap (1 Viewer)

[brew8]

I just rebuilt an SM420 to mate to an extreem Bends adapter, I used an early SM420 and it's out of a 2 ton truck, however on the end of the idler shaft in the rear it has a large washer with two bolts used to hold the shaft in the bearing, the lighter version has a snap ring around the shaft so the adapter will not fit over the bolts. Should I grind the bolt heads? Get a smaller washer? or has anyone used another tack to make it work, sorry the pic is so bad, thanks, Larry

 

[Pin_Head]

I have seen other people grind the bolt heads to make enough clearance.

 

[brew8]

Thats what I thought I'd try, thanks for the conformation, cheers, Larry

 

[Poser]

I have ground the heads of the bolts and had to remove material from the inside of the adapter to make it work....

 

[bigbluefj]

call him back

give steve a call back he should be able to help you

kevin

 

[brew8]

I actually ground the heads of the bolts and found a slightly thinner retaining washer drilled it out and it cleared fine, now if I could find where I put that thin bearing for the output shaft, I would be in good shape, Larry

 

[theo]

and found a slightly thinner retaining washer

I haven't done this mod. Just playing devil's advocate. Aren't you compromising strength by using a thinner washer? The washer is responsible for anchoring the shaft in position along it's axis. If you weaken it don't you risk excessive thrust if the washer bends?

 

[too tall]

Maybe you should find some 3/8 nft tapered allen bolts and countersink the washer that way nothing will protrude above the washer . Just a thought.

 

[brew8]

The tranny is out of a 2.5 to truck, I doubt that the cruiser with a 2F will exert that much torque to the tab to force it out, the reduction is from nearly a quarter inch to maybe 3/16 maybe an 8th inch maybe a 30 percent reduction, the lighter version uses a clip to hold it in no washer, let me know if you think I'm in trouble, cheers, Larry

 

[theo]

The tranny is out of a 2.5 to truck, I doubt that the cruiser with a 2F will exert that much torque to the tab to force it out . . .

But how much more gear reduction does your cruiser have than that 2 ton truck? And the 2F probably has as much or more engine torque as a Chevy 235 or 261.

Still, it sounds like you're using a pretty thick washer. You probably wouldn't be in trouble if you weren't from Billings!

Go Griz

 

[too tall]

I'm sure the fix you tried will be fine .There isn't that much torque front to back on the shaft . Which bearing are you talking about? If it's the one with the retaining ring around it then it goes in the adapter plate between the adapter and the t-case . The write up on EBI cruiserparts website should clarify even more.

 

[brew8]

Hey Theo, I went to Idaho State, but my daughter spent two years at U of M and is finishing at MSU, so I asked her is she a Cat or a Griz, she says go Griz, cheers, Larry

 

[CruisinGA]

But how much more gear reduction does your cruiser have than that 2 ton truck?

Probably no more at all in front of the transmission

 

[theo]

Probably no more at all in front of the transmission

But torque is transferred from the wheels to the engine - through the entire drivetrain - every time you let off the gas, or descend a hill, or pop the clutch, etc. So overall gear ratio matters. double d'oh dude!