Dowel pins in transmission case?
11-29-2009, 05:14 PM
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Dowel pins in transmission case?
I am in the middle of replacing the 4L60E transmission in my '99 Silverado. Upon removal of the trans from the truck, I see that the dowel pins are installed into the transmission case and not the engine block. Is that normal procedure now? I am used to having the dowel pins installed into the engine block.
Three or four months after I purchased the truck in August 2004, I had to have the transmission rebuilt (the one that I am removing). I had a warranty, so the dealership had a local Aamco do the rebuild. Would they have put the dowel pins in the transmission case? Heck, they didn't bother to reinstall one of the top three bolts either ( the one next to the top bolt on the passenger-side).
Either way is fine with me. Whichever one works the best. I was just surprised to see them done that way.
Three or four months after I purchased the truck in August 2004, I had to have the transmission rebuilt (the one that I am removing). I had a warranty, so the dealership had a local Aamco do the rebuild. Would they have put the dowel pins in the transmission case? Heck, they didn't bother to reinstall one of the top three bolts either ( the one next to the top bolt on the passenger-side).
Either way is fine with me. Whichever one works the best. I was just surprised to see them done that way.
11-29-2009, 08:43 PM
#5
They belong in the engine block. I think what happens is the aluminum corrodes and holds on to them over a period of time. When you remove the trans they just pull out. Knock them out and wire wheel them if you can. Or use some sand paper to lightly sand/clean them up a bit. Then reinstall them in the engine.
The one bolt that is missing might be normal. Some of the LS1 engines have a dead hole there. Literally there is not a hole nor the threads. Take a look while you have the trans out to see if this is the case. I call that the one o'clock bolt hole.
The one bolt that is missing might be normal. Some of the LS1 engines have a dead hole there. Literally there is not a hole nor the threads. Take a look while you have the trans out to see if this is the case. I call that the one o'clock bolt hole.
12-04-2009, 06:15 PM
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They belong in the engine block. I think what happens is the aluminum corrodes and holds on to them over a period of time. When you remove the trans they just pull out. Knock them out and wire wheel them if you can. Or use some sand paper to lightly sand/clean them up a bit. Then reinstall them in the engine.
The one bolt that is missing might be normal. Some of the LS1 engines have a dead hole there. Literally there is not a hole nor the threads. Take a look while you have the trans out to see if this is the case. I call that the one o'clock bolt hole.
The one bolt that is missing might be normal. Some of the LS1 engines have a dead hole there. Literally there is not a hole nor the threads. Take a look while you have the trans out to see if this is the case. I call that the one o'clock bolt hole.
I did exactly as you suggested for the dowel pins too, and everything worked out fine. I just got the truck back on the road tonight. It's nice having second, fourth & reverse again!
That not being able to back up crap sucked really bad...I really had to plan my route & parking scenario if I took the truck out.Scott
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