SM420 AA Ques. 3-Spd. Plate with 4-Spd. Case - Pirate4x4.Com : 4x4 and Off-Road Forum

fj40bill · 08-31-2001, 11:49 AM

Can an AA SM420 adaptor plate and spud shaft for a 3-speed case be used with a 4-speed case if I use the 3-speed gears. I'm considering purchasing a SM420 with AA 3-speed adaptors and would like to use the 4-speed case out of my 76 with a set of 3-speed gears. Talked to AA and they seem to agree that the bolt pattern and bearing are the same. Only difference would be the 10 spline spud shaft. I do not have the adaptors to verify my hypothesis... <IMG SRC="smilies/question.gif" border="0">

Jimyrigdfj · 08-31-2001, 04:22 PM

Everything is exactly the same and the four speed gears should fit right in.

fj40bill · 08-31-2001, 07:54 PM

Sounds like the answer I was looking for, except I'm lookin to use the 3-speed gears with a 4-speed case. Either way, sounds like the spud shaft spline count is what makes the call.

FeCamel · 09-01-2001, 11:32 AM

Yeah, both cases have the same bolt pattern, only difference is spline count in the gears.

08-31-2001, 11:49 AM	#1 (permalink)
fj40bill Registered User Join Date: May 2001 Member # 4811 Location: Singer Island, Florida Posts: 153	SM420 AA Ques. 3-Spd. Plate with 4-Spd. Case Can an AA SM420 adaptor plate and spud shaft for a 3-speed case be used with a 4-speed case if I use the 3-speed gears. I'm considering purchasing a SM420 with AA 3-speed adaptors and would like to use the 4-speed case out of my 76 with a set of 3-speed gears. Talked to AA and they seem to agree that the bolt pattern and bearing are the same. Only difference would be the 10 spline spud shaft. I do not have the adaptors to verify my hypothesis... <IMG SRC="smilies/question.gif" border="0">

08-31-2001, 04:22 PM	#2 (permalink)
Jimyrigdfj Registered User Join Date: Aug 2001 Member # 6434 Location: colorado Posts: 118	Everything is exactly the same and the four speed gears should fit right in. __________________ WRECKING CREW 4X4

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08-31-2001, 07:54 PM	#3 (permalink)
fj40bill Registered User Join Date: May 2001 Member # 4811 Location: Singer Island, Florida Posts: 153	Sounds like the answer I was looking for, except I'm lookin to use the 3-speed gears with a 4-speed case. Either way, sounds like the spud shaft spline count is what makes the call.

09-01-2001, 11:32 AM	#4 (permalink)
FeCamel Registered User Join Date: May 2000 Member # 922 Location: Reno, NV Posts: 895	Yeah, both cases have the same bolt pattern, only difference is spline count in the gears.