new gears? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

ocbaud · 03-07-2003, 12:35 AM

i've been thinking, instead of frontend kit or new exhaust for my birthday, i could ask for a new gear kit for my rearend.

there is a richmond gear package in jegs for $304 that includes everything needed to install the new ring & pinion, new bolts for the cover, cover gasket, bearings, shims, seal, and oil.

i'm thinking replacing the 2.73's would help my gas milege quite a bit and also help my truck be a little quicker too!

i would be getting 3.73's and then an eaton posi later this summer, possibly

CHaingKaiShek · 03-07-2003, 12:45 AM

Could be mistaken but I think the lower gear ratio (2.73) would be better for gas miliage but worse for takeoff at the line. The 3.73s would give a better take off, but have an adverse effect on gas miliage.

However, 3.73s are good all around gears. You should not notice too much of a change if you switch to them. However I hear it's quite a PITA job to do.

Jeff :p

ocbaud · 03-07-2003, 12:48 AM

i say it would help with the gas because it would keep my in my powerband without having to have my foot on the pedal as much.

so its like this:

with the 2.73's to get the acceloration i want i would have to have the pedal 3/4's of the way in

with the 3.73's i would have to have the pedal 1/4 or the way in

so something to that affect

with the lower gears, i wouldnt have to use the accelorator as much since the gears would help a lot

CHaingKaiShek · 03-07-2003, 12:56 AM

At the same time, it's going to require more throttle at higher RPM's to move the same amount of truck. :p

The engine would also be working harder (turning more RPM) to keep the truck at 60mph, than it would with the lower gear ratio. It's a double edged sword really, but hey. The changes should not be too bad. If you were going to 4.56's or something however.

Jeff

ocbaud · 03-07-2003, 12:58 AM

i was thinking about something along the lines of 6.32's?

do you think that would be to low?

CHaingKaiShek · 03-07-2003, 01:03 AM

Quote:

Originally posted by ocbaud
i was thinking about something along the lines of 6.32's?

do you think that would be to low?

Sounds good to me.

But I'm not buying your fuel.

Jeff

ocbaud · 03-07-2003, 01:08 AM

Quote:

Originally posted by CHaingKaiShek

Sounds good to me. But I'm not buying your fuel.

Jeff

what about my tires?

BaggedC10 · 03-07-2003, 01:08 AM

Wait to replace the gears once you get a real motor in there---A 350!

67_SS396 · 03-07-2003, 02:24 AM

I hope you are also thinking about the cost of having someone (competent) to install your new gear set. It's not something that the average Joe can do. You have to have the proper tools to do it right. Typically it will run you $100-$200 for an install, atleast around here it does. I have a guy that will do my gears for a case of beer and teach me at the same time, but that's a different story. He owes me.

79BIG10 · 03-07-2003, 03:14 AM

Eric- I would wait to get the posi and gears at the same time. You will need to get both setup by a professional like Ryan mentioned above. If you installed the gears then later did the posi you will be paying twice the labor. Plus another problem is that the carrier you have now may not work (probably won't) with the new gear setup. If it's like my rear axle it has a series 3 and the gears you are probably looking at are series 4. They have 3.73 that can fit the 3.73 but grab the series 4 and be much better off.

03-07-2003, 12:35 AM	#1
ocbaud Garage Queen Material Join Date: Oct 2002 Location: USA Posts: 4,129	new gears? i've been thinking, instead of frontend kit or new exhaust for my birthday, i could ask for a new gear kit for my rearend. there is a richmond gear package in jegs for $304 that includes everything needed to install the new ring & pinion, new bolts for the cover, cover gasket, bearings, shims, seal, and oil. i'm thinking replacing the 2.73's would help my gas milege quite a bit and also help my truck be a little quicker too! i would be getting 3.73's and then an eaton posi later this summer, possibly

03-07-2003, 12:45 AM	#2
CHaingKaiShek I love goooooold! Join Date: Jan 2003 Location: In the middle of Hell, Arizona Posts: 133	Could be mistaken but I think the lower gear ratio (2.73) would be better for gas miliage but worse for takeoff at the line. The 3.73s would give a better take off, but have an adverse effect on gas miliage. However, 3.73s are good all around gears. You should not notice too much of a change if you switch to them. However I hear it's quite a PITA job to do. Jeff :p __________________ "Musha ring dum a doo dum a da Whack for my daddy-o Whack for my daddy-o There's whiskey in the jar-o."

03-07-2003, 12:56 AM	#4
CHaingKaiShek I love goooooold! Join Date: Jan 2003 Location: In the middle of Hell, Arizona Posts: 133	At the same time, it's going to require more throttle at higher RPM's to move the same amount of truck. :p The engine would also be working harder (turning more RPM) to keep the truck at 60mph, than it would with the lower gear ratio. It's a double edged sword really, but hey. The changes should not be too bad. If you were going to 4.56's or something however. Jeff __________________ "Musha ring dum a doo dum a da Whack for my daddy-o Whack for my daddy-o There's whiskey in the jar-o."

03-07-2003, 01:08 AM	#8
BaggedC10 Under construction! Join Date: Aug 2002 Location: NorCal Posts: 1,065	Wait to replace the gears once you get a real motor in there---A 350! __________________ 2001 Silverado bagged on 22's. Sold

03-07-2003, 02:24 AM	#9
67_SS396 Registered User Join Date: Mar 2000 Location: Blue Ridge, Tx Posts: 1,172	I hope you are also thinking about the cost of having someone (competent) to install your new gear set. It's not something that the average Joe can do. You have to have the proper tools to do it right. Typically it will run you $100-$200 for an install, atleast around here it does. I have a guy that will do my gears for a case of beer and teach me at the same time, but that's a different story. He owes me. __________________ Fawker Fab three seater rock crawler buggy 498 BBC/SM465/203/205 doubler, propane, 5.13's, 42" PB Rockers '66 C10 - The new hot rod '77 3+3 Dually - 12 valve 4wd conversion tow rig project '28 Ford 2 door sedan street rod RevLimit Offroad "Hang on beer, we can do this."

03-07-2003, 12:48 AM	#3
ocbaud Garage Queen Material Join Date: Oct 2002 Location: USA Posts: 4,129	i say it would help with the gas because it would keep my in my powerband without having to have my foot on the pedal as much. so its like this: with the 2.73's to get the acceloration i want i would have to have the pedal 3/4's of the way in with the 3.73's i would have to have the pedal 1/4 or the way in so something to that affect with the lower gears, i wouldnt have to use the accelorator as much since the gears would help a lot

03-07-2003, 12:58 AM	#5
ocbaud Garage Queen Material Join Date: Oct 2002 Location: USA Posts: 4,129	i was thinking about something along the lines of 6.32's? do you think that would be to low?

03-07-2003, 03:14 AM	#10
79BIG10 I'm back with 2nd truck! Join Date: Feb 2002 Location: Texas Posts: 3,775	Eric- I would wait to get the posi and gears at the same time. You will need to get both setup by a professional like Ryan mentioned above. If you installed the gears then later did the posi you will be paying twice the labor. Plus another problem is that the carrier you have now may not work (probably won't) with the new gear setup. If it's like my rear axle it has a series 3 and the gears you are probably looking at are series 4. They have 3.73 that can fit the 3.73 but grab the series 4 and be much better off. __________________ 1979 Chevrolet Bonanza Big10 "Tootsie Roll" 1985 Chevrolet Silverado (wife's) Member of the Southern Bowties Club "Don't underestimate how sexy a fat man who drinks to excess can be." Homer Simpson



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