Put in a 5.3 and now towing is horrible
05-02-2012, 01:12 PM
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Staging Lane
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Put in a 5.3 and now towing is horrible
I just installed a rebuilt 5.3 into my 01 ECSB. Flat top pistons, 243 heads and a z06 cam. Now that i have 2k miles i took the boat out (3000 lbs) and going up some steep hills could only do 50-55mph in third at 4500rpm's. Truck went up that hill much better when i had the 4.8 in there. Is the cam the problem or something else? Installed 4.10 gears also.
05-02-2012, 01:15 PM
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The cam isnt the perfect pick, but still it should have quite a bit more power/tq than the stock 4.8.
Who tuned it?
ive pulled 8-10k # trailers with my 5.3 back when it was stock and it didnt have any problems like that, something is up..
Whats your transmisison temps?
Who tuned it?
ive pulled 8-10k # trailers with my 5.3 back when it was stock and it didnt have any problems like that, something is up..
Whats your transmisison temps?
05-02-2012, 01:16 PM
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4500rpm in 3rd only going 50-55? That does not sound right at all. Did you retune? Aftermarket converter? The LS6 cam will move the powerband up a little bit, but not that dramatically.
05-02-2012, 01:19 PM
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4.10s in 3rd with a 30" tire should be 100mph no converter slip.
Sounds like the transmission is goin out or something is up..
2nd gear at 4500 should be roughly 60mph
05-02-2012, 01:31 PM
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This. Something is way off. I had 4.30s w/ 30" tires and my RPMs werent anywhere near this bad.
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05-02-2012, 03:02 PM
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Toward the top of the hill the tranny temp hit 190-200 so not bad there. the engine temp hit 250-260. The transmission has 135,000 miles on it. The guy who built the motor did a mild tune and said he would do a better tune once i had 3000 miles on it. The MAF was dirty and kicked off a P0171 code the other day. Would that account for the lack of power?