Question about 1991 GMC C1500

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Transmission I have transmission out a 77 buick regal need to know if it will fit my 1984 gmc pickup.

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The tail shaft is probably a different length than your original trans so you will need to get another driveshaft. Most likely a one piece from a full size wagon or sedan will fit. Remove the carrier for the two piece shaft or it will hit when you go over a bump or load the truck up and bend the new shaft. Other than that it should be a bolt in job.
Before you take things apartm measure the total length of both transmissions. If they are different length's ( more than an inch) then go under the truck and measure from yoke to yoke in a straight line to get a length for a one piece shaft. Also measure the length of the back shaft of the 2 piece. Then go to the scrap yard and find a replacement shaft to fit the one piece dimension or the length of your old shaft plus the difference in length of the 2 transmissions (within an inch). This will save you a lot of headaches once you get the new trans in and are trying to figure out what you are going to do now, when the driveshaft doesn't fit. Hope this helps.

Posted on May 29, 2010


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