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#1 |
Registered User
Join Date: Feb 2009
Location: Morrisdale, PA
Posts: 9
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78 Step Side 6 cylinder 4 speed
Hey guys and gals. Just acquired this old 78 4x4 step side with the six cylinder truck, pretty solid but transfer case and tranny look to be both leaking lube pretty good. The guy I bought it from only used it to plow with then it sat. Can you tell me the model transfer case I have and tranny? The transfer case has low and hi range and the tranny has the granny gear. Both are very quiet and work great. How hard is it to replace the seals on these. Tranny looks pretty heavy. Am I looking at a very expensive repair if only seals are bad? Pretty sure they would need removed. I did do a search but did not find the info I needed. Thanks .
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#2 |
Moderator
![]() Join Date: Oct 2008
Location: Wentworth, NH
Posts: 4,951
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Re: 78 Step Side 6 cylinder 4 speed
SM465 Transmission. Really a 3 speed with low gear. Heavier than a dead horse. Plowing with a manual transmission is rough on the clutch.
Check the front axle for manual locking hubs. If it has them then you prolly have an NP205 or a part-time converted NP203. The NP203 is a massive chain drive transfer case and probably heavier than the transmission. It's full time 4x4 with a range box and a diff. Stock NP203 shift pattern. Lo-Loc (Low range, center diff locked) Lo (Low range, center diff unlocked) N (No drive to axles) Hi (Hi range, center diff unlocked) Hi-Loc (Hi range, center diff locked) Converted NP203 shift pattern Lo-Loc (Low range, 4x4) Lo (Low range, 2wd) N (No drive to axles) Hi (Hi range, 2wd) Hi-Loc (Hi range, 4x4) The NP205 is part time and gear drive. It's slightly smaller than the NP203 but is still cast iron and full of gears... very heavy. NP205 Shift pattern 4LO (Low range 4wd) N (No drive to axles) 2HI (2WD no drive to front) 4HI (High range 4wd)
__________________
1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials...
And please let us know if and how your repairs were successful. |
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#3 | |
Registered User
Join Date: Feb 2009
Location: Morrisdale, PA
Posts: 9
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Re: 78 Step Side 6 cylinder 4 speed
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#4 |
Registered User
Join Date: Dec 2011
Location: Arlington WA
Posts: 1,728
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Re: 78 Step Side 6 cylinder 4 speed
they are, its a giant chunk of iron, i didnt even try to pick mine up when i swapped it in
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GMC C15 355 SM465 3.73 80 C10 cruiser build thread 79 short stepside crew cab. big and ugly. build thread |
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#5 |
Registered User
Join Date: Feb 2009
Location: Morrisdale, PA
Posts: 9
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Re: 78 Step Side 6 cylinder 4 speed
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#6 |
Moderator
![]() Join Date: Oct 2008
Location: Wentworth, NH
Posts: 4,951
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Re: 78 Step Side 6 cylinder 4 speed
Don't be scared of it unless you don't have a concrete pad/floor to do it on. It's no heavier than an automatic transmission and transfer case just smaller.
Transmission jacks are $150-$200.
__________________
1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials...
And please let us know if and how your repairs were successful. |
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#7 |
Registered User
Join Date: Feb 2009
Location: Morrisdale, PA
Posts: 9
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Re: 78 Step Side 6 cylinder 4 speed
Well I stopped by the tranny shop and he said it looked to him like just the transfer case leaking and he or I could replace the seals without dropping anything. But I will be watching for a transmission jack now that I looked at them. Save a guy a lot of grief wrestling those things in and out. Thanks for all the help.
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#8 |
Registered User
Join Date: Feb 2009
Location: Morrisdale, PA
Posts: 9
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Re: 78 Step Side 6 cylinder 4 speed
Well I took some advice from here and changed out the front transfer case seal myself yesterday. Did a good pressure washing under there first. Wasn't as bad as I thought and the leak is gone! Just wanted to thank those who gave me advice and some answers. Appreciated. Now on to adjusting that one barrel carb...lol.
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#9 |
Registered User
Join Date: May 2009
Location: Motor City
Posts: 9,194
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Re: 78 Step Side 6 cylinder 4 speed
Good job!
![]() Sounds like you learned something and maybe saved a few bucks in the process. K
__________________
Chevrolet Flint Assembly 1979-1986 GM Full Size Truck Engineering 1986 - 2019 Intro from an Old Assembly Guy: http://67-72chevytrucks.com/vboard/s...d.php?t=342926 My Pontiac story: http://forums.maxperformanceinc.com/...d.php?t=560524 Chevelle intro: http://www.superchevy.com/features/s...hevy-chevelle/ |
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