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#1
06-02-2005, 08:07 PM
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1991 3+3 1 ton flatbed
hello, i have the above listed, it's a work truck, runs great. The guy i got it from said the computer won't let it shift....it goes 1,2 and.......
2,....i really would like some input on this because i got plans for it... i think it would make a neat project....Thanks Jon 
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#2
06-02-2005, 08:32 PM
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Re: 1991 3+3 1 ton flatbed
Pretty sure a 91 would have a 700R4 which is not computer controlled. Of course, it could have a newer 4L60E which is computer controlled.
Usually, when there is no shift into 3rd (especially on a work truck), it means the 3-4 clutches are gone. If that is the case, it needs to be rebuilt. //2000CAYukon
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#3
06-02-2005, 10:23 PM
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Re: 1991 3+3 1 ton flatbed
he's right, it's a 700r4, 4l60e was introduced in late 92, your 3-4 clutches are out, look into a rebuild or replacement.
__________________
Matthew Brough  1997 Geo Prizm -- 301,000 miles 2000 Honda Accord -- 225,000 miles 2004 GMC Yukon XL -- 223,000 miles 1987 Jeep Comanche -- 116,000 miles 
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#7
06-05-2005, 10:24 PM
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Re: 1991 3+3 1 ton flatbed
Without crawling under the truck you can tell if it has a 4l80E or turbo 400--If there is a second relay on the firewall by the fuel pump relay identical to the F.P.Relay then it has a T-400--If not it has a 4L80E
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