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#1 |
Registered User
Join Date: Sep 2016
Location: BC, Canada
Posts: 16
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1971 C10 250 I6 Transmission Question
Hi Everyone,
Hope you are all well. I recently picked up my first C10, I've always wanted one and finally stumbled across a 71 with a frame off resto for a good deal. It currently has a 250 I6 with 4 Speed Manual Transmission(Muncie?). I recently discovered a leak in the tranny and it had me thinking about converting the truck to automatic at this point. My question is, it appears that newer transmissions with OD are the recommended upgrade here. Could you suggest what automatic transmissions would be compatible for a 71 C10 with a 250 I6? Thanks for your time. -Mike |
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#2 |
Senior Member
![]() Join Date: Jan 2007
Location: Turlock, CA
Posts: 8,675
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Re: 1971 C10 250 I6 Transmission Question
hi there. don't know the answer to your question, but welcome and nice looking truck you've got there.
__________________
Please help my sister in law with her battle with cancer https://gofund.me/902f6fce Project "C10 Fever" (68 factory black 396 swb) Project "Little Sister" (70 c10 blue original paint refresh) Project "Blue Bomb" (70 c30 blue original paint refresh) SOLD Project "Vitamin C" (71 c10 orange original paint refresh) SOLD |
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#3 |
Registered User
Join Date: Mar 2015
Location: st cloud mn
Posts: 163
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Re: 1971 C10 250 I6 Transmission Question
Most would recommend the 5 spd from a 1 ton or 3/4 ton. The 5 spd out of the 1/2 ton trucks is pretty weak. I believe the recommended 5 spd is the NV4500.
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#4 |
Registered User
Join Date: Mar 2016
Location: Long Island NY
Posts: 598
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Re: 1971 C10 250 I6 Transmission Question
The 250 I6 has the same Bellbousing bolt pattern as a small block Chevy, so any 200r4 or 700r4 with that bolt pattern will bolt right up. Personally I'd go with the 200r4 for its more even ratios and smaller size. I don't know how either compares to the dimensions of the SM465 that's probably in your truck but you'll likely need to move the transmission crossmember and modify the driveshaft length either way.
You'll need a neutral/internally balanced flexplate from a I6 or small block, just count the teeth on your flywheel or look it up because I don't know it. Can't really help with the torque converter either but I'd assume a stock I6, V6 or small V8 would be fine. |
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#5 |
Senior Member
![]() Join Date: Dec 2013
Location: Gods country East,Tn
Posts: 8,545
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Re: 1971 C10 250 I6 Transmission Question
Automatics are for girls
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__________________
![]() 1967 Factory short bed - Old school '71 - 350 / 4bolt / 487 heads / Edelbrock C3BX Muncie M-22 4 speed / Hurst Comp plus Factory 12 bolt posi 3.73 / 255-70-15 Smoothed firewall / Factory cowl induction Power disc brakes / power steering / 3.5-5" drop |
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#6 |
Registered User
Join Date: Dec 1999
Location: Austin, TX, USA
Posts: 7,721
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Re: 1971 C10 250 I6 Transmission Question
As mentioned above, either the TH700R4 or the TH200 4R (my preference!) are good. And for a manual, a T5 from a 4.3 equipped S10 or Astro van would be the way to go.
__________________
44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax |
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#7 |
Registered User
Join Date: Sep 2016
Location: BC, Canada
Posts: 16
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Re: 1971 C10 250 I6 Transmission Question
Thanks for all the help. I think I am going to spend the next 6 months gathering the parts and hopefully grab an automatic steering column.
Much appreciated. -Mike |
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