1981 Silverado Won't Budge

[mooner7]

Hi all, I have a 1991 Silverado that engine (5 ltr) died, spun a bearing. We replaced engine with a 1977 350 and everything bolted up perfect. Now the problem is there is no power at all to the wheels. It doesn't matter what gear is selected the truck does not move. All we did tranny wise was remove it with eng, change fluid and filter and put it back in. I'm not 100% sure which tranny it has but is four speed (1,2,3 D) and has solonoids inside. The fluid never warms up and stays at the full level all time. Is the tranny elect. controlled, perhaps we broke a wire.

Thanks

[dlewis1111]

Hi all, I have a 1991 Silverado that engine (5 ltr) died, spun a bearing. We replaced engine with a 1977 350 and everything bolted up perfect. Now the problem is there is no power at all to the wheels. It doesn't matter what gear is selected the truck does not move. All we did tranny wise was remove it with eng, change fluid and filter and put it back in. I'm not 100% sure which tranny it has but is four speed (1,2,3 D) and has solonoids inside. The fluid never warms up and stays at the full level all time. Is the tranny elect. controlled, perhaps we broke a wire.

Thanks

 

You didn't line up the torque converter with the flex plate properly and when you bolted the tranny to the engine you busted the pump fins. Thus no fluid is pumping through the tranny. You get to drop the tranny, pull the pump, and rebuild it. You need a couple of specially prepared jacking bolts to do this. Your best bet is to find a local tranny shop and tell them what you did so that they can get you the correct gaskets and pump parts. Sucks, but you will never make that mistake again. Oh, and your title says 1981 truck.

[beave84]

When you changed the filter did make sure that you got the old O-ring out of the hole the filter slides into, and install the new O-Ring.That'll do it everytime. It should be the 700R-4 trans.

[mooner7]

Slid torque converter into tranny as far as possible than mounted tranny onto eng on stand and did up six connecting bolts tranny mounted right up flush. Lined up torque convertor with holes in flex plate (aprox 1/4 inch gap) and installed bolts pulling torque convertor tight to flex plate a bit at a time. Will drop pan again and ensure that I got old filter o ring out and new one goes in.

Although could be pump as I pulled tranny back out and ensured torque converter filled and than slid it in and could turn it very easy.

Hoped maybe electrical problem so didn't have to pull it again, oh well gettin it out and in in 3 hrs last time.

Thanks

[mooner7]

Oops and your right it is an 1981 truck not 91, been a long day lol

[LeoS41280]

When you put the converter in the trans pump, did you make sure the slots in the converter hub engaged the pump correctly? Just because it went in, doesn't mean it's in correctly.

[mooner7]

How would yu know if slots engaged into pump other than once in all the way turning it, however if it wasn't engaged than when tranny bolted up it could have damaged pump. Guess I'll pull the tranny again and take off the pump than off to junk yard for a pump and get gaskets etc from tranny shop.

[LeoS41280]

You look to see where the cogs are in the pump. Then hold the converter slots so they line up and experience will tell you when it is in correctly. It's hard to explain how you tell.

[dlewis1111]

How would yu know if slots engaged into pump other than once in all the way turning it, however if it wasn't engaged than when tranny bolted up it could have damaged pump. Guess I'll pull the tranny again and take off the pump than off to junk yard for a pump and get gaskets etc from tranny shop.

 

Dont buy a pump from the junkyard. You can buy new replacement parts for under 50 bucks and update that pump to the latest specs so that it will have more vanes and be much more efficient.

[mooner7]

Valid point, after more searching ya I will just upgrade this one. As to type of tranny my vin number is 2GCDC14H4C1119757 does vin contain tranny type? And on left side of tranny case (not the pan) 1226110935, these are only numbers I can see right now (tranny still installed).

Thanks good forum lots of help.

[88K5]

Did you hook the tv cable back up?

[GMstrong]

The truck would still move without the tv cable.But would probably slip shifting.Since the tv is a main point of pressure in the trans.i agree with th above posts drop it off to a tranny shop.dont buy anything used.