fallguy
Full Access Member
- Joined
- May 11, 2011
- Posts
- 189
- Reaction score
- 49
- Location
- Minot, ND
- First Name
- Jamie
- Truck Year
- 1986
- Truck Model
- Silverado K10
- Engine Size
- 350
On the highest, at 60-70 mph cruising, when I come to a point that I have to slow down,,,a machine gun vibration starts...can feel it in the whole truck and it's not a slight vibration either. So then if I shift it out of overdrive it runs fine, no slow down vibration.
Stopped at a red light, light turns green, truck won't move...just makes noise, let off gas and shift out of OD....able to move again.
Thoughts?
Also, Could this be why my truck has been so lethargic for over a year and can't seem to get out of its own way....much less anything else on the road???
GM 290hp 350, 4.10 axles, 1406 Edelbrock carb, 700R4 tranny.
Stopped at a red light, light turns green, truck won't move...just makes noise, let off gas and shift out of OD....able to move again.
Thoughts?
Also, Could this be why my truck has been so lethargic for over a year and can't seem to get out of its own way....much less anything else on the road???
GM 290hp 350, 4.10 axles, 1406 Edelbrock carb, 700R4 tranny.
Basically high stall for stock. It's about 400 rpm higher than OEM. And it's possible the gutless issue could have been the trans. If you had a leak in the valve body somewhere holding a servo or band on when it was supposed to be off, that's like having brakes drag but actually even worse since it's dragging on the power train not the chassis. Could have been what burnt up the fluid too. So did you get to keep your core trans? Do Keep it if you can. Throw it out behind the shed on a block to keep it out of the water and cover it with something to keep water out of the pan so you'll have it for a rainy day to build if you need it. 
Your trans mount was in good shape obviously, and the crossmember bolted in tight. If you got rough enough with it, you could have done some damage. It also depends on which 3 bolts where in. With the alignment pegs and the 2 outside lower bolts good and tight, the bellhousing will stay put pretty good for light to mild driving habits. I've seen 4 work very well before in a Rat Rod that there was no way in hell they could get to the top 2 bolts.
And you're positive the transmission isn't dragging? Like trying to be in 2 gears at the same time. That's rare but it can happen if you have a servo getting fluid pressure from a misaligned valve in the valve body, or an inproper pin length to a band from a servo etc. If it's doing that, you should feel some type of braking or dragging. And then the only other thing I can think of, is your cam timing may be off. I'm not sure who installed the last timing chain or if it was recent or not.
