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1987 chev 4x4 1 ton pickup,can I put in an overdrive 400 or?
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farmer
New User
| Posts: 5
| Joined: 07/09
Posted: 07/16/09
05:16 AM
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Hi I have been given my cousin's 1987 chev 1 ton crew 4x4 pickup diesel 6.2 low miles.(still have to pick it up out west)
My question is can I put an overdrive tranmission in it? I presume it has a 400 auto 3 speed. I would imagine it geared very low and might be a push for hwy. use.
Can a newer 400 or 350 or 700 fit , or modify, adaptor ?
Much thankful for any help.
farmer
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1978k-20
User
| Posts: 142
| Joined: 05/08
Posted: 07/16/09
08:35 AM
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depending on what you are gonna do with it is gonna determine what trans would be the best. don't get a 700r4 or 4l60e. if you want to run an auto 4l80e would be your best be for an auto with overdrive. they are expensive though. same with a gear vendors overdrive unit. i would get like an nv4500 5 speed.
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farmer
New User
| Posts: 5
| Joined: 07/09
Posted: 07/16/09
03:45 PM
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Thanks for your reply
I would imagine these are computor controled transmissions except the gear venders.
Cost is always a concern. Maybe just a gear set change or taller tires to give better performance on the highway.
Thanks farmer
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Benjy_26
New User
| Posts: 33
| Joined: 09/09
Posted: 09/30/09
01:05 PM
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Since you don't have an ECU on that rig, I would go with a 4L80, which is basically a TH400 with an OD. The other GM tranny's all have the same bell housing pattern (as long as they came from a Chevy and not a BOP model). Keep in mind though that if you do step away from the TH400, you may have to modify the transfer case for it to mate up. If I recall, your truck should come equipped with a NP208 with a 32 spline female input.
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