Am I getting Hosed? SM465 4speed - The 1947 - Present Chevrolet & GMC Truck Message Board Network

TreverSlyFox · 10-02-2004, 08:40 PM

I've got a 71 GMC C3500 1Ton Dually 350 w/sm465 4 speed. My tranny locked up in 2nd gear so I pulled it and dropped it off to my local garage to have it rebuilt. Now the Machanic calls and says he can't order new syncros for it and is now looking for some good used ones and he thinks he has some laying around if he can find them.

Now it's my understanding that the SM465 was used from 1968 to about 1991 so how can syncros not be avalible for it, NAPA or somebody must have parts for it? Am I getting taken for a ride here?

shuttermutt · 10-02-2004, 08:50 PM

I do believe he's full of crap. For example:

CHA Industries
Transmission Exchange Company (eBay store)
Drivetrain Specialists of Las Vegas
S&S Truck Parts

The list goes on and on. Hope this helps!

*FormerMember* · 10-02-2004, 09:35 PM

Is it possible you got one of the last SM420's?

**kwmech** · 10-02-2004, 09:48 PM

Quote:

Originally Posted by grendel

Is it possible you got one of the last SM420's?

Shouldn't be in a 71 but I have seen stranger. Syncros are also available at the dealer and at All Trans.

*FormerMember* · 10-02-2004, 09:54 PM

Quote:

Originally Posted by kwmech

Shouldn't be in a 71 but I have seen stranger. Syncros are also available at the dealer and at All Trans.

Hey, what are you doing over here?

gonebad2 · 10-02-2004, 10:24 PM

A buddy of mine has rebuilt 4 ( that I know of ) SM 465 trannys at home. I believe he was able to have NAPA order all the parts he needed. I'm off work next week. I'll go see him and ask.

1969 GMC · 10-03-2004, 12:37 AM

that is b.s.

it could be a 420, although the last official year was '67, but I have heard of it being in a few '68s. Is your reverse on the passenger or driver side of the shifting pattern, and are there 2 or 1 pto covers? If its the passenger side reverse and 2 pto covers, its a 465.

ZOOMY · 10-03-2004, 01:05 AM

First of all, what makes him think the synchros are bad ? Did it grind going between 2 & 3, or 3 & 4 ? My wife manages to lock one of mine up occasionally. I just pull the stick out, reach down inside & move the slider so everything is back into neutral & reinsert the stick. When the bottom of the stick (nylon) is worn out, it'll come out of the shifting fork, but won't go back in. The other 4x4 is a low mile truck & she never locks that one up.

chevyhouse · 10-03-2004, 03:50 AM

I have a good used 465 that you can have for a lot less than it would take to rebuild that one. Tranny guys are like women, once you sniff a lie---run like hell because you've already spent to much.

Rod · 10-03-2004, 10:08 AM

I had a T221 Rockwell transfer case and a SM420 in a 1969 GMC 3/4 4x4 actually...it was all correct....but Canada's truck assembly plant in Oshawa sometimes used up the older US parts it seems.

72C203503ONTHETREE · 10-03-2004, 11:03 AM

I have seen complete 465 rebuild kits for 465 on e bay for a buy it now price of $105, that included bearings, gaskets, synchros, shims, etc.. Look under parts and enter transmissions then search for chevy.

10-02-2004, 08:40 PM	#1
TreverSlyFox Registered User Join Date: Sep 2003 Location: Houston, Missouri Posts: 17	Am I getting Hosed? SM465 4speed I've got a 71 GMC C3500 1Ton Dually 350 w/sm465 4 speed. My tranny locked up in 2nd gear so I pulled it and dropped it off to my local garage to have it rebuilt. Now the Machanic calls and says he can't order new syncros for it and is now looking for some good used ones and he thinks he has some laying around if he can find them. Now it's my understanding that the SM465 was used from 1968 to about 1991 so how can syncros not be avalible for it, NAPA or somebody must have parts for it? Am I getting taken for a ride here?

10-02-2004, 08:50 PM	#2
shuttermutt Don't say "Oops!", Doctor Join Date: Nov 2003 Location: Houston, TX Posts: 677	I do believe he's full of crap. For example: CHA Industries Transmission Exchange Company (eBay store) Drivetrain Specialists of Las Vegas S&S Truck Parts The list goes on and on. Hope this helps! __________________ 'Mutt 1968 CST LWB: R.I.P. 1967 Chevelle: TPI 454 beast 1967 C10 SWB: Claimed when Bumpster didn't put it on his list

10-02-2004, 10:24 PM	#6
gonebad2 Merciless Butcher Join Date: Oct 2003 Location: CC Nevada Posts: 1,447	A buddy of mine has rebuilt 4 ( that I know of ) SM 465 trannys at home. I believe he was able to have NAPA order all the parts he needed. I'm off work next week. I'll go see him and ask. __________________ Your Bought And Sold....I Got Your Soul!

10-03-2004, 12:37 AM	#7
1969 GMC Registered User Join Date: Feb 2003 Location: The Rubber City Posts: 5,498	that is b.s. it could be a 420, although the last official year was '67, but I have heard of it being in a few '68s. Is your reverse on the passenger or driver side of the shifting pattern, and are there 2 or 1 pto covers? If its the passenger side reverse and 2 pto covers, its a 465. __________________ 1969 GMC K2500 1996 Honda Accord 2007 Kawasaki KLR 650

10-03-2004, 01:05 AM	#8
ZOOMY Senior Member Join Date: Feb 2003 Location: WIS Posts: 1,752	Synchros First of all, what makes him think the synchros are bad ? Did it grind going between 2 & 3, or 3 & 4 ? My wife manages to lock one of mine up occasionally. I just pull the stick out, reach down inside & move the slider so everything is back into neutral & reinsert the stick. When the bottom of the stick (nylon) is worn out, it'll come out of the shifting fork, but won't go back in. The other 4x4 is a low mile truck & she never locks that one up.

10-02-2004, 09:35 PM	#3
FormerMember Account Suspended Join Date: Feb 2004 Posts: 3,051	Is it possible you got one of the last SM420's?

10-03-2004, 03:50 AM	#9
chevyhouse BEER-Vacation in a can... Join Date: Jun 2001 Location: wichita, ks Posts: 444	I have a good used 465 that you can have for a lot less than it would take to rebuild that one. Tranny guys are like women, once you sniff a lie---run like hell because you've already spent to much. __________________ Kurt 03' Trailblazer 69' C10 "SPSHL-K", 388 stroker/BTO 700R4, 2400 stall, 3.73 posi, lwb, fleetside long box, 3.5"/5" drop, 18" Budnik 2000 Yamaha V-Star 1100 Custom For Sale-87' V10-4x4, 408/700r4, 4.10's PM for pics

10-03-2004, 10:08 AM	#10
Rod Join Date: Dec 1999 Location: Eastern - Manitoba Canada, Winnipeg Posts: 4,369	I had a T221 Rockwell transfer case and a SM420 in a 1969 GMC 3/4 4x4 actually...it was all correct....but Canada's truck assembly plant in Oshawa sometimes used up the older US parts it seems. __________________ Senior active founding member. 70 3/4 ton GMC Suburban 4x4 250/4 spd. 71 1/2 ton Suburban Chevy 4x4, 350/350 72 Chev 1 ton tow truck 402BB w/Holmes 440 wrecker on propane 2005 FLSTSCI Harley Springer 85 FXSB Harley Lowrider 72 Triumph 650 Bonneville 5spd "Poor people don't have hobbies" Quote from wife.

10-03-2004, 11:03 AM	#11
72C203503ONTHETREE Registered User Join Date: Apr 2004 Location: Grant, Alabama Posts: 504	I have seen complete 465 rebuild kits for 465 on e bay for a buy it now price of $105, that included bearings, gaskets, synchros, shims, etc.. Look under parts and enter transmissions then search for chevy. __________________ 72 Chevy C20, SOLD (Dang it.) 09 Challanger RT six speed in all black. 74 Datsun 710 wagon, all 1.8 liters of screaming Datsun power. 73 C10 long bed, 350/350 combo, nice shape.

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