what automatic Tranny would replace a Manual tranny in an 1995 gmc sierra 1500sl

Asked by Dec 15, 2012 at 01:37 PM about the 1995 GMC Sierra 1500 C1500 SL Standard Cab SB

Question type: Maintenance & Repair

I have a 1995 gmc sierra 1500sl it had a 4-speed manual tranny I am wanting to convert over to an automatic tranny. The truck currently has a 350 5.7ltr. engine.

4 Answers

35,235

4L60E is the stock trans for that year. Not sure what exactly you would have to do with the electronics though. There may be an empty plug for the wiring harness and if that's the case I believe all you would need is the wiring harness and your PCM flashed for the trans. If there isn't a plug then you would need to run wires for it.

10,805

For '94 and '95 pre vortecs the stock tranny is the 4L60e. The PCM doesn't control the tranny, there is a separate tranmission control module under the hood. ?? on the wiring to add it in. (Needs some engine values, TPS for sure) The 700r4 would bolt in, essentially the same tranny only not electric shifting. Just need to rig up the torque converter lock/unlock if you want it (Not hard), saves attacking the PCM. The TV cable bracket and driveshaft should be at any wreckers. Can't think of any other parts. Or I used a TCI TCU from summit to run a 4L60e in my '92 GMC. 800 for the module from summit. Laptop tuneable? Can add a tow haul (boost tranny line pressure) adjust all shift points, firmness etc.

65

Way to much work. Sell that truck and buy the truck equipped the way you want (factory equipped) you will be happier in the long run and avoid loooots of hard work and headaches!

200

Bob must be a new car salesman.

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