transmission question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

superman3405 · 01-08-2008, 06:01 PM

I have the truck tore apart now, got a shipment in from LMC, rocker panels, cab corners and all that good stuff. The new motor sounds great but a small problem with the transmission....when I put it in gear there is a hard pull either foward or backwards depending on if it is in drive or reverse. No hesitation in going into gear...I am worried there is too much torque coming from the motor to the transmission. Would this be a tourqu converter problem or something else. Usually in my other older trucks....79 ford there is a smooth change between changing gears. What do ya'll think?

Longhorn Man · 01-08-2008, 06:11 PM

is the idle set too high?

**WorkinLonghorn** · 01-08-2008, 06:15 PM

Check your U-joints and rear gears for play.This will cause a big clunk and a small jerk into gear. If you idle is too high then you will get a jolt. Never heard of a TQ being too stiff for easy engagement,maybe someone else has seen this.anybody? Also re-check the mounts.

67_C-30 · 01-08-2008, 06:28 PM

It's definitely not too much TQ. I'd check the idle setting and U joints as suggested by the Longhorn lovers!

[In no way am I implying that these two respected members share love for anything but the Longhorn!]The only other thing I can think of is a loose pinion nut. My brother's '89 C1500 did this. The bad news is that it trashed the pinion.

Longhorn Man · 01-08-2008, 06:57 PM

Quote:

as suggested by the Longhorn lovers

Uhhh, can we chainge that to;
...The lovers of longhorns...
I think we would BOTH apreciate it.

Quote:

From seinfeld Not that there's anything WRONG with that!!!

superman3405 · 01-08-2008, 07:03 PM

it idles as park at around 1000, in drive around 500
is that normal?

I will check the mounts tommorrow.

67_C-30 · 01-08-2008, 07:13 PM

Yeah, that's a little high. Usually 500-600 in gear and 700-800 is about normal. Are you running a big cam or anything?

67_C-30 · 01-08-2008, 07:14 PM

Quote:

Originally Posted by Longhorn Man

Uhhh, can we chainge that to;
...The lovers of longhorns...
I think we would BOTH apreciate it.

LOL! I didn't even mean it that way, but I admit, it just doesn't sound good does it?

Lovers OF Longhorns it is!

superman3405 · 01-08-2008, 07:39 PM

cam is not stock. I did not build the motor but it is edlebrock all the way thru. A bit of a loppy sounds but not much.

01-08-2008, 06:01 PM	#1
superman3405 Junior Member Join Date: Mar 2007 Location: Tennessee Posts: 80	transmission question I have the truck tore apart now, got a shipment in from LMC, rocker panels, cab corners and all that good stuff. The new motor sounds great but a small problem with the transmission....when I put it in gear there is a hard pull either foward or backwards depending on if it is in drive or reverse. No hesitation in going into gear...I am worried there is too much torque coming from the motor to the transmission. Would this be a tourqu converter problem or something else. Usually in my other older trucks....79 ford there is a smooth change between changing gears. What do ya'll think? __________________ ------------------------------------------------- 1972 Chevy C-10 Short Bed (Ol'Blue) 350/350TH 2003 Chevy Silverado Z71 2007 Honda MiniVan...yup we should all be so lucky

01-08-2008, 06:11 PM	#2
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: transmission question is the idle set too high?

01-08-2008, 06:15 PM	#3
WorkinLonghorn Senior Member Join Date: Dec 2006 Location: Studio City, Calif. Posts: 2,883	Re: transmission question Check your U-joints and rear gears for play.This will cause a big clunk and a small jerk into gear. If you idle is too high then you will get a jolt. Never heard of a TQ being too stiff for easy engagement,maybe someone else has seen this.anybody? Also re-check the mounts. __________________ '69 GMC C2500 Custom Camper, 8 1/2' bed, New GM 350, NP 435 Close Ratio 4spd. Trans., 3.73 Dana-60 open.Camper and Trailer wiring, PS, PB, AC, tach , three gas tanks, stereo speakers, 2nd owner, Work-Truck supreme.

01-08-2008, 06:28 PM	#4
67_C-30 I have a radical idea! Join Date: Jan 2005 Location: Sweet Home Alabama! Posts: 6,513	Re: transmission question It's definitely not too much TQ. I'd check the idle setting and U joints as suggested by the Longhorn lovers! [In no way am I implying that these two respected members share love for anything but the Longhorn!]The only other thing I can think of is a loose pinion nut. My brother's '89 C1500 did this. The bad news is that it trashed the pinion. __________________ '67 C-30 Dually Pickup 6.2 Turbo Diesel, NP435 ‘72 C-10 SWB , 350 4bbl, TH350 '69 C-10 SWB , 250 L6, 3 OTT '69 GMC C3500, dump truck, 351 V6, NP435 '84 M1009 CUCV Military Blazer 67 C-30 Turbodiesel build thread http://67-72chevytrucks.com/vboard/s...d.php?t=254096 My trucks http://s226.photobucket.com/albums/d...ediafilter=all Member of the 1-Ton Club! Last edited by 67_C-30; 01-08-2008 at 07:17 PM.

01-08-2008, 07:03 PM	#6
superman3405 Junior Member Join Date: Mar 2007 Location: Tennessee Posts: 80	Re: transmission question it idles as park at around 1000, in drive around 500 is that normal? I will check the mounts tommorrow. __________________ ------------------------------------------------- 1972 Chevy C-10 Short Bed (Ol'Blue) 350/350TH 2003 Chevy Silverado Z71 2007 Honda MiniVan...yup we should all be so lucky

01-08-2008, 07:13 PM	#7
67_C-30 I have a radical idea! Join Date: Jan 2005 Location: Sweet Home Alabama! Posts: 6,513	Re: transmission question Yeah, that's a little high. Usually 500-600 in gear and 700-800 is about normal. Are you running a big cam or anything? __________________ '67 C-30 Dually Pickup 6.2 Turbo Diesel, NP435 ‘72 C-10 SWB , 350 4bbl, TH350 '69 C-10 SWB , 250 L6, 3 OTT '69 GMC C3500, dump truck, 351 V6, NP435 '84 M1009 CUCV Military Blazer 67 C-30 Turbodiesel build thread http://67-72chevytrucks.com/vboard/s...d.php?t=254096 My trucks http://s226.photobucket.com/albums/d...ediafilter=all Member of the 1-Ton Club!

01-08-2008, 07:39 PM	#9
superman3405 Junior Member Join Date: Mar 2007 Location: Tennessee Posts: 80	Re: transmission question cam is not stock. I did not build the motor but it is edlebrock all the way thru. A bit of a loppy sounds but not much. __________________ ------------------------------------------------- 1972 Chevy C-10 Short Bed (Ol'Blue) 350/350TH 2003 Chevy Silverado Z71 2007 Honda MiniVan...yup we should all be so lucky



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