Need transmission help asap!

Tim L 1990 · 03-03-2009, 05:45 PM

I have a 1989 chevy c1500 pick up, 2wheel drive 305 engine with 160000 miles on the truck, original transmission/ engine.The other day I was driving and my gears slipped, then went back to normal (automatic tranny btw). Then yesterday I was driving they did it again then my truck was stuck in first gear. The truck revs up high when I drive it and only moves when I put it into low gear or reverse and can only go about 15-20 mph when driving. It doesnt work in drive, over drive or second. I need to know how I would figure out the model number of the transmission for when Im lookin at the chiltons manual and I also need to know what I can try to do to fix it before spending alot of money buying a new transmission. Could it be the modulator or somethin like that or do you think the whole transmission is gone.

gmctrucks · 03-03-2009, 06:02 PM

700R that's a lot of miles on any trans.

Tim L 1990 · 03-03-2009, 06:04 PM

You think I am going to have to replace it, or do you think it could be a modulator or somethin

chevyguy · 03-03-2009, 06:14 PM

160K for a 700R4 is good mileage. I bet its a rebuild. Probally needs it anyways with 160K on it.

mudseeker · 03-03-2009, 08:14 PM

sounds like it's time for new clutches and steels. if you can pull the trans yourself, a shop can rebuild it fairly cheap ($300-$600).

silverhairdeere · 03-03-2009, 08:31 PM

are you sure it isn't a turbo 400 ? and yes could be the modulator .

shd

Case 7230 · 03-04-2009, 05:48 AM

Quote:

Originally Posted by Tim L 1990

You think I am going to have to replace it, or do you think it could be a modulator or somethin

Can you give a bit more history? How many miles since the last fluid and filter change?
To remove any confusion can you confirm that your trans does have overdrive.

hotrodpc · 03-20-2009, 12:52 AM

My guess is a 700r4 since he says its a 1500. Oh yeah, 160K miles is absolutley awesome for 4l60e or 700r4. I'd says its slipping clutches from wear. I don't believe 700r4 has a modulator as some reminded me today. Also a vac modulator just decides shift points and I would not think it would cause a slip.

hotrodpc · 03-20-2009, 12:53 AM

This guy hasn't been back in awhile, so he may have given up on it.

03-03-2009, 05:45 PM	#1
Tim L 1990 Full Member Join Date: Nov 2008 Location: New York Posts: 10	Need transmission help asap! I have a 1989 chevy c1500 pick up, 2wheel drive 305 engine with 160000 miles on the truck, original transmission/ engine.The other day I was driving and my gears slipped, then went back to normal (automatic tranny btw). Then yesterday I was driving they did it again then my truck was stuck in first gear. The truck revs up high when I drive it and only moves when I put it into low gear or reverse and can only go about 15-20 mph when driving. It doesnt work in drive, over drive or second. I need to know how I would figure out the model number of the transmission for when Im lookin at the chiltons manual and I also need to know what I can try to do to fix it before spending alot of money buying a new transmission. Could it be the modulator or somethin like that or do you think the whole transmission is gone.

03-03-2009, 06:14 PM	#4
chevyguy Senior Member Join Date: Sep 2005 Location: ALABAMA Posts: 3,370	160K for a 700R4 is good mileage. I bet its a rebuild. Probally needs it anyways with 160K on it. __________________ Friends dont let friends use body lifts USMC 92-96 USCG 98 to present

03-03-2009, 08:14 PM	#5
mudseeker Senior Moderator Join Date: Feb 2006 Location: michigan Posts: 6,374	sounds like it's time for new clutches and steels. if you can pull the trans yourself, a shop can rebuild it fairly cheap ($300-$600). __________________ i'd rather be hunting

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03-03-2009, 06:02 PM	#2
gmctrucks Senior Member Join Date: Nov 2006 Location: Houston,Texas Posts: 4,035	700R that's a lot of miles on any trans.

03-03-2009, 06:04 PM	#3
Tim L 1990 Full Member Join Date: Nov 2008 Location: New York Posts: 10	You think I am going to have to replace it, or do you think it could be a modulator or somethin

03-03-2009, 08:31 PM	#6
silverhairdeere Senior Member Join Date: Feb 2008 Location: land between the lakes tn Posts: 1,184	are you sure it isn't a turbo 400 ? and yes could be the modulator . shd

03-20-2009, 12:52 AM	#8
hotrodpc Senior Member Join Date: Jul 2008 Location: OKC, OK Posts: 3,149	My guess is a 700r4 since he says its a 1500. Oh yeah, 160K miles is absolutley awesome for 4l60e or 700r4. I'd says its slipping clutches from wear. I don't believe 700r4 has a modulator as some reminded me today. Also a vac modulator just decides shift points and I would not think it would cause a slip.

03-20-2009, 12:53 AM	#9
hotrodpc Senior Member Join Date: Jul 2008 Location: OKC, OK Posts: 3,149	This guy hasn't been back in awhile, so he may have given up on it.