Acceleration problem!

Aparis123 · Aug 10, 2016

Alright so I have a 2005 Dodge Ram QC 4.7L magnum 2WD. I have 325/60R20 tires which is (35.4) I recently regeared the rear end with Yukon 4.88 gears. Just wondering if it's normal with this size tires that my truck will barely push 70mph??? Which really with the tire offset its really going 80mph. Is this normal or do I have another issue? I recently replaced my EGR Valve and fixed an exhaust manifold gasket leak. Also some new spark plugs. Yet the truck is still very sluggish and won't go over 70mph (80mph) any help would be appreciated. My 04 that I had 22s and low pro tires would run 115mph and it was a 4.7 also.

Ceri · Aug 10, 2016

Regearing obviously reduces the top speed of the truck, unless you snuck a couple of extra gears into the transmission at the same time. 4.88 is pretty aggressive to boot. I would guess that you are in fact reaching the upper limits by around 80, but you can check a gear calculator to see what it says.

KuntRRyBoy · Aug 11, 2016

Ceri said:
Regearing obviously reduces the top speed of the truck, unless you snuck a couple of extra gears into the transmission at the same time. 4.88 is pretty aggressive to boot. I would guess that you are in fact reaching the upper limits by around 80, but you can check a gear calculator to see what it says.

I agree with Ceri. 4.88 is pretty high normally only rock crawlers or mudding use those on high lifted trucks. 3:92 or 4:10's would have been a better way to go.

Ms Gulf Coast Ruff Ryders

Mbrp.Ram · Sep 19, 2016

Uhmm

You going baja'ing up Yosemite with that gearing?

JAMMAN · Sep 19, 2016

This thread is really messing with my ADHD.

Acceleration problem!

Aparis123

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Ceri

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KuntRRyBoy

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Mbrp.Ram

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JAMMAN

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