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#1 |
Registered User
Join Date: Jun 2001
Location: barnum
Posts: 127
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Wanted trans info
Have 85 1/2 ton which trans quit today and I have two 700r4s from 3/4 ton vans 90 and 91.Shall I stick with 350 turbo or go to 700r4. Truck is going forsale whatever way I go.Also have 350 trans from 78 van but it dosen,t have the 3 prong plug 85 trans has.Any ideas thanks
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#2 |
Registered User
Join Date: Mar 2000
Location: Kansas, USA
Posts: 175
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If you want to do minimal work and parts chasing, then in my humble opinion, replace it with another 700R4. The 350 turbo is shorter, so you'll have to find a longer driveshaft, relocate the cross member, and mess with other stuff like that.
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#3 |
Overworked and Underlaid
Join Date: May 2002
Location: Flagstaff,Arizona
Posts: 1,279
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does your truck have a TH350 right now or a 700R4?if it has a TH350 then imo you should stick with that.i know i would catch some h*** for saying this but i dont like 700R4's and for the cost involved in having a TH350 truck converted over to a 700R4 you could build 3 or 4 TH350's and for the cost of swapping you only gain about 2 MPG-a friend of mine back home had his 77 K5 swapped from a TH350 to a 700R4-cost him 1500 dollars in total and he went from 10 to 13 MPG's-not worth it imo for a 3 MPG gain.so basically i would stick with the TH350 and since your selling it anyway then with the TH350 you would have less cost involved in a truck your not keeping.the 3 prong plug you mentioned is just a switch for a lockup convertor(TH350C) and if you do go with the 78 tranny it will still work you just wont have the lockup ive ran them both ways to me there not that big of a deal but some people like them.just my 10 cents on the subject
__________________
I'd rather push a Chevy than drive a Ford The Beast-1978 C10 LWB Red-1978 C10 LWB (Uncle Mike)Michael Henry Millett 11/5/1957 to 03/08/2012 Gone but will never be forgotten-RIP (Uncle Chuck)Charles Manning Gulbronsen Sr 1956-2012 Taken from us to soon but you will live on in our hearts-RIP |
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#4 |
Registered User
Join Date: Mar 2000
Location: Kansas, USA
Posts: 175
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Yes, good point. Guess I assumed it had the 700R4, since that's what it should of had originally. If it has a 350 in it right now, by all means, stay with the 350.
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#5 |
Registered User
Join Date: Jun 2001
Location: barnum
Posts: 127
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My glovebox door says trans is mx1 3spd.Does anyone know of trans decoding site.Did 85s offer 350 and700r4s trans?Thanks
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#6 |
Overworked and Underlaid
Join Date: May 2002
Location: Flagstaff,Arizona
Posts: 1,279
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i do believe in 1985 they offered both the TH350 and the 700R4.
__________________
I'd rather push a Chevy than drive a Ford The Beast-1978 C10 LWB Red-1978 C10 LWB (Uncle Mike)Michael Henry Millett 11/5/1957 to 03/08/2012 Gone but will never be forgotten-RIP (Uncle Chuck)Charles Manning Gulbronsen Sr 1956-2012 Taken from us to soon but you will live on in our hearts-RIP |
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#7 |
BAD BOW-Silverado XST
Join Date: May 2000
Location: Senior Member from Austin, TX
Posts: 6,431
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700R4 started in '82 in limited amounts. '83 and later models were more popular with the 700R4. If you have R-N-D-2-1 on the column you have a 350TH. If you have R-N-D-3-2-1 then it's a 700R4. Both were availble for our trucks. Stick with a stock replacement since you're selling it. If your keeping it install the 700R4. I have a 700R4 in my truck. It's not stock either.
![]() 350th pan - square with a corner cut off. Modulator pointing to the rear of the truck. 700R4 square oil pan and no modulator. It does have a four prong connection on the driverside. |
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