RPMs revin high - The 1947 - Present Chevrolet & GMC Truck Message Board Network

BodyShopDropOut12 · 02-25-2005, 11:15 PM

Ok. Picked up the new truck tonight and had a little trouble with the rpms. When I first ran it down the road I was goin 55 and the rpms were at about 2500-3000k. Got gas and I jumped on the highway and goin 60 it was close to 4500 about to be in the redline. Brought it back down to 50-55 and it was screaming at 4k. Anyone know what might be causing this? It's got the TH400 with no o/d, and in fact now that I think about it I don't think I even remember 3rd kickin in. The p/o said before I picked it up that he was replacin the gasket and somethin else on the tranny, sorry forget what.

magnethead · 02-26-2005, 12:46 AM

what motor and rear gear does it have, is it the '79 in your sig? TH400: 2.48, 1.48, 1 for reference

Prerunner1982 · 02-26-2005, 12:53 AM

definately sounds like you had it in 2nd.. or it was slipping horribly!

BodyShopDropOut12 · 02-26-2005, 01:34 AM

It is the 79 with the 350. Haven't checked gears yet. The shift indicator needle is missin but I knew I was in drive. Remember cause I accidentally had it in nuetral when I was leavin the gas station. Whatever it was it had the truck runnin hard. Smelled somethin burnin, pulled over to give it a rest and it went away.

*1FaastC10* · 02-26-2005, 02:05 AM

i'd bet on a bad trans.

CbHeEaVsYt · 02-26-2005, 02:11 AM

yea prolly sounds like it was slippin like prerunner1982 said

that is wat my truck wat doin right before the tranny blew pos th700r4

cb

BodyShopDropOut12 · 02-26-2005, 10:52 AM

Oh damn. He told me to call him today if I had any questions and I'll ask what exactly it was he had replaced on the tranny and get back to you guys. But since I'm definitely not experienced enough to do it, how much would you guess it might cost to have a shop rebuild it? I just hope it don't give out for next two weeks till I get next paycheck.

magnethead · 02-26-2005, 05:16 PM

Here's a little table just so you get an idea of what OD is worth...what the TH400 doesn't have.

RPM: 2800; Trans: 1-1; axle: 4.10-1; speed: 60.92 MPH
RPM: 2800; Trans: 1-1; axle: 3.73-1; speed: 66.96 MPH
RPM: 2800; Trans: 1-1; axle: 3.55-1; speed: 70 MPH

all with an assumed 30" tire.

02-25-2005, 11:15 PM	#1
BodyShopDropOut12 9 months Join Date: May 2004 Location: Gahanna, OH/Jacksonville, AR Posts: 430	RPMs revin high Ok. Picked up the new truck tonight and had a little trouble with the rpms. When I first ran it down the road I was goin 55 and the rpms were at about 2500-3000k. Got gas and I jumped on the highway and goin 60 it was close to 4500 about to be in the redline. Brought it back down to 50-55 and it was screaming at 4k. Anyone know what might be causing this? It's got the TH400 with no o/d, and in fact now that I think about it I don't think I even remember 3rd kickin in. The p/o said before I picked it up that he was replacin the gasket and somethin else on the tranny, sorry forget what. __________________ "You'ins gonna go?"

02-26-2005, 01:34 AM	#4
BodyShopDropOut12 9 months Join Date: May 2004 Location: Gahanna, OH/Jacksonville, AR Posts: 430	It is the 79 with the 350. Haven't checked gears yet. The shift indicator needle is missin but I knew I was in drive. Remember cause I accidentally had it in nuetral when I was leavin the gas station. Whatever it was it had the truck runnin hard. Smelled somethin burnin, pulled over to give it a rest and it went away. __________________ "You'ins gonna go?"

02-26-2005, 02:11 AM	#6
CbHeEaVsYt Pick up man Join Date: Feb 2005 Location: trenton mi Posts: 135	yea prolly sounds like it was slippin like prerunner1982 said that is wat my truck wat doin right before the tranny blew pos th700r4 cb __________________ heres sum pics of my truck 82 silverado c10 heres my baby 1990 k1500 check out this 1957 chevrolet for sale

02-26-2005, 10:52 AM	#7
BodyShopDropOut12 9 months Join Date: May 2004 Location: Gahanna, OH/Jacksonville, AR Posts: 430	Oh damn. He told me to call him today if I had any questions and I'll ask what exactly it was he had replaced on the tranny and get back to you guys. But since I'm definitely not experienced enough to do it, how much would you guess it might cost to have a shop rebuild it? I just hope it don't give out for next two weeks till I get next paycheck. __________________ "You'ins gonna go?"

02-26-2005, 12:46 AM	#2
magnethead 7000 #'s of american IRON Join Date: Dec 2004 Location: north tx Posts: 883	what motor and rear gear does it have, is it the '79 in your sig? TH400: 2.48, 1.48, 1 for reference

02-26-2005, 12:53 AM	#3
Prerunner1982 Registered User Join Date: Oct 2002 Location: Edmond, OK Posts: 5,906	definately sounds like you had it in 2nd.. or it was slipping horribly!

02-26-2005, 02:05 AM	#5
1FaastC10 Account Suspended Join Date: Oct 2002 Location: Elkhart, IN Posts: 6,400	i'd bet on a bad trans.

02-26-2005, 05:16 PM	#8
magnethead 7000 #'s of american IRON Join Date: Dec 2004 Location: north tx Posts: 883	Here's a little table just so you get an idea of what OD is worth...what the TH400 doesn't have. RPM: 2800; Trans: 1-1; axle: 4.10-1; speed: 60.92 MPH RPM: 2800; Trans: 1-1; axle: 3.73-1; speed: 66.96 MPH RPM: 2800; Trans: 1-1; axle: 3.55-1; speed: 70 MPH all with an assumed 30" tire.



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