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10-08-2019, 08:17 AM
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#1 |
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Registered User
Join Date: Feb 2012
Location: Vinton, Va.
Posts: 493
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History/differences of 3 speed trannies ?
I have a cracked tranny case in a 68. 3 speed manual tranny. Currently looking for replacement but now noticing some differences, especially with the side covers. Some are 7 bolt, like mine, and others are different. Looks like around 1970 they changed. Can anyone elaborate on that ? For example, are they all the same length, gear ratio, all synchronized . Interchangeable? Tks.
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"You are not forgotten" USMC 75-79 (Aviation Ordnance Tech- F-4 Phantom) 1959 H-D Panhead. Owned since 1978. Currently with son in Lawton, OK. 1968 Chevy Custom SWB pick up. Fleetside. Lowered 4/6. Totally refurbished. 1966 Pontiac GTO. 4 speed. Saved original 389. Now has slightly built 455 engine. 355 rear gears. Very fun to drive ! Last edited by panhead59; 10-08-2019 at 08:44 AM. |
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10-08-2019, 11:01 AM
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#2 |
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Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,945
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Re: History/differences of 3 speed trannies ?
I don't know about the differences but I have a 3 speed still in my all original 68 I'm not going to use.
There was a thread a month are so ago on here that we talked about this. I posted pictures of mine then. 
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1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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10-08-2019, 11:10 AM
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#3 |
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Registered User
Join Date: Oct 2006
Location: Orland Park Il
Posts: 2,041
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Re: History/differences of 3 speed trannies ?
4 bolt covers are non synchro first gear in ‘67 later 7 bolt are stronger and completely synchronized
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68 GMC C3500 Longhorn DRW 67 Chevy C10 LWB 90 Mustang Gt 90 Mustang Notchback |
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10-08-2019, 03:39 PM
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#4 |
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Registered User
Join Date: Apr 2014
Location: Southern Iowa
Posts: 308
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Re: History/differences of 3 speed trannies ?
Stick with finding another 7 bolt side cover Saginaw and you'll be fine.
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1972 C30 Grain Hauler, 350/400 1967 1500 GMC Stepside SWB, In Transformation Process 1967 RS/SS Camaro 350/TKO600 |
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10-08-2019, 03:46 PM
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#5 |
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Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,707
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Re: History/differences of 3 speed trannies ?
There’s also a 7 bolt Muncie.
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10-08-2019, 03:56 PM
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#6 | |
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Registered User
Join Date: Apr 2014
Location: Southern Iowa
Posts: 308
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Re: History/differences of 3 speed trannies ?
Quote:
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1972 C30 Grain Hauler, 350/400 1967 1500 GMC Stepside SWB, In Transformation Process 1967 RS/SS Camaro 350/TKO600 |
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10-08-2019, 04:35 PM
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#7 |
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Registered User
Join Date: Feb 2012
Location: Vinton, Va.
Posts: 493
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Re: History/differences of 3 speed trannies ?
Great info as usual ! Thanks everybody. I'll stick with looking for one with 7 bolt side cover. Mine has 3-4 inch crack by drain plug. Looks like it was "braised" (spelling- goldish color-leaks).
__________________
"You are not forgotten" USMC 75-79 (Aviation Ordnance Tech- F-4 Phantom) 1959 H-D Panhead. Owned since 1978. Currently with son in Lawton, OK. 1968 Chevy Custom SWB pick up. Fleetside. Lowered 4/6. Totally refurbished. 1966 Pontiac GTO. 4 speed. Saved original 389. Now has slightly built 455 engine. 355 rear gears. Very fun to drive ! |
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