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Rear End Swap Ratios? #4454354
07/09/17 02:00 PM
07/09/17 02:00 PM
Joined: Apr 2014
Posts: 1,343
South Central PA
Delta Online happy OP
Delta  Online Happy OP
Joined: Apr 2014
Posts: 1,343
South Central PA
Looking to daily drive the S10 more to keep the miles off the GTI, but with the 3.42 gearset (confirmed with po) and locker it makes a terrible driver. Excellent fuel economy, but falls flat on itself up any hill or mountain. Heck even reverse is a chore up my incline driveway.

Build code on the truck says it originally came with 3.73's. I was wondering if a 4.10 out of an auto truck would be better suited for my location. Typical speed range here is 45-55mph. The NV1500 trans in it now's 5th gear ratio is .83. Swapping the rear isn't the hard part, it's my math that fail me. What do you guys suggest?


'17 VW GTI 2.0T - 6MT - 11K - Edge 0w40
'15 Camry SE - 2.5 - 22K - PP 0w20
'99 S10 - 2.2 5MT - 157K - PP 10w30
Re: Rear End Swap Ratios? [Re: Delta] #4454362
07/09/17 02:07 PM
07/09/17 02:07 PM
Joined: Oct 2005
Posts: 4,633
Atlanta
DuckRyder Offline
DuckRyder  Offline
Joined: Oct 2005
Posts: 4,633
Atlanta
What size are the tires?


Robert
  • 2007 Toyota Prius Touring
  • 2005 Honda Civic Sedan
  • 1972 Ford F100
Re: Rear End Swap Ratios? [Re: DuckRyder] #4454367
07/09/17 02:09 PM
07/09/17 02:09 PM
Joined: Apr 2014
Posts: 1,343
South Central PA
Delta Online happy OP
Delta  Online Happy OP
Joined: Apr 2014
Posts: 1,343
South Central PA
215/75/15 tires.


'17 VW GTI 2.0T - 6MT - 11K - Edge 0w40
'15 Camry SE - 2.5 - 22K - PP 0w20
'99 S10 - 2.2 5MT - 157K - PP 10w30
Re: Rear End Swap Ratios? [Re: Delta] #4454368
07/09/17 02:12 PM
07/09/17 02:12 PM
Joined: Mar 2009
Posts: 2,680
Cedarbrae, Ontario
xxch4osxx Offline
xxch4osxx  Offline
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Posts: 2,680
Cedarbrae, Ontario
I'd go for a 3.90, but thats just me.


2015 RAM SXT Crew Cab 5.7 with 6 speed tranny.

2008 Mazda 3 GS Sport Hatchback 5sp MT (Girlfriend's car)

Re: Rear End Swap Ratios? [Re: Delta] #4454371
07/09/17 02:18 PM
07/09/17 02:18 PM
Joined: Oct 2005
Posts: 4,633
Atlanta
DuckRyder Offline
DuckRyder  Offline
Joined: Oct 2005
Posts: 4,633
Atlanta
So nominally 27.6-27.7” ...

Let me see if I can find a calculator to do the math for us... I don’t seem to have one that will solve for other than a 1:1 high.


Robert
  • 2007 Toyota Prius Touring
  • 2005 Honda Civic Sedan
  • 1972 Ford F100
Re: Rear End Swap Ratios? [Re: Delta] #4454372
07/09/17 02:19 PM
07/09/17 02:19 PM
Joined: Oct 2010
Posts: 7,101
Michigan
A_Harman Offline
A_Harman  Offline
Joined: Oct 2010
Posts: 7,101
Michigan
Downshift into 4th gear if you want to climb a hill. If you put the 4.10 in the rear end in place of the 3.42, it's numerically the same as downshifting into 4th.

In 4th gear with the 3.42 diff you have 3.42 x 1 = 3.42 overall gearing.
In 5th gear with the 4.10 diff you would have 4.10 x .83 = 3.403 overall gearing.
Basically the same.

Or do you just want an overall peppier feeling with the truck in any gear?
You know the tradeoff; performance for fuel economy.
Or split the difference, and put 3.73's in it.
Or put the 4.10's in it, and if you don't like the gearing, put 10% taller tires on it to emulate a 3.73.
Or put the 4.10 in it, and swap in a T56 double overdrive tranny.

Last edited by A_Harman; 07/09/17 02:22 PM.

1985 Z51 Corvette track car
2002 Camaro Z28 LS1/6-speed
2001 Dodge Ram 2500 diesel
1972 GMC 1500 shortbed project truck
Re: Rear End Swap Ratios? [Re: Delta] #4454377
07/09/17 02:26 PM
07/09/17 02:26 PM
Joined: Oct 2005
Posts: 4,633
Atlanta
DuckRyder Offline
DuckRyder  Offline
Joined: Oct 2005
Posts: 4,633
Atlanta
You can play with https://www.ringpinion.com/calculators/Calc_RPM.aspx

That will give you an RPM in a .80 high gear.

Looks like a 4.11:1 is going to put you in the 2150-2200 RPM range at 55.


Robert
  • 2007 Toyota Prius Touring
  • 2005 Honda Civic Sedan
  • 1972 Ford F100
Re: Rear End Swap Ratios? [Re: Delta] #4454378
07/09/17 02:27 PM
07/09/17 02:27 PM
Joined: Dec 2016
Posts: 7,191
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 7,191
Waco, TX
I had 3.73's in a 2.3 4-cyl Ranger and always wished it had 4.10's

I had to shift out of 5th in a strong head wind or going up a hill with the A/C on.


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: Rear End Swap Ratios? [Re: Delta] #4454381
07/09/17 02:27 PM
07/09/17 02:27 PM
Joined: Apr 2014
Posts: 1,343
South Central PA
Delta Online happy OP
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Posts: 1,343
South Central PA
Overall I'd like the truck to be more peppier. I know that's asking alot out of the 120hp 4 banger, but the previous owner drove all highway and when the original rear end locked up he changed ratios. Around here I do have to go in 4th for a hill, but the mountains are a chore. 3rd gear is the only option and the engine is screaming for mercy to even do 40mph...

Edit. Thanks Duck, looks like what I might go with.

Last edited by Delta; 07/09/17 02:28 PM.

'17 VW GTI 2.0T - 6MT - 11K - Edge 0w40
'15 Camry SE - 2.5 - 22K - PP 0w20
'99 S10 - 2.2 5MT - 157K - PP 10w30
Re: Rear End Swap Ratios? [Re: Delta] #4454386
07/09/17 02:30 PM
07/09/17 02:30 PM
Joined: Oct 2005
Posts: 4,633
Atlanta
DuckRyder Offline
DuckRyder  Offline
Joined: Oct 2005
Posts: 4,633
Atlanta
If you know the transmission ratios you can use:

http://www.tremec.com/calculadora.php

To get speeds in gears.


Robert
  • 2007 Toyota Prius Touring
  • 2005 Honda Civic Sedan
  • 1972 Ford F100
Re: Rear End Swap Ratios? [Re: Delta] #4454405
07/09/17 02:46 PM
07/09/17 02:46 PM
Joined: Sep 2015
Posts: 6,086
Kalifornia Kollective
BrocLuno Offline
BrocLuno  Offline
Joined: Sep 2015
Posts: 6,086
Kalifornia Kollective
I'd be looking at 3.90 also. A few RPM less in 5th on the highway vs 4.10's, but still more gear than you have now. Happy compromise smile


Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.
Re: Rear End Swap Ratios? [Re: Delta] #4454440
07/09/17 03:24 PM
07/09/17 03:24 PM
Joined: Oct 2005
Posts: 4,633
Atlanta
DuckRyder Offline
DuckRyder  Offline
Joined: Oct 2005
Posts: 4,633
Atlanta
It doesn’t look like anyone makes a 3.90:1 for it (it is a 7.5” 10 bolt right?).

2.73, 3.08, 3.23, 3.42, 3.73, 4.11, 4.30, 4.56.


Robert
  • 2007 Toyota Prius Touring
  • 2005 Honda Civic Sedan
  • 1972 Ford F100
Re: Rear End Swap Ratios? [Re: Delta] #4454448
07/09/17 03:31 PM
07/09/17 03:31 PM
Joined: Apr 2014
Posts: 1,343
South Central PA
Delta Online happy OP
Delta  Online Happy OP
Joined: Apr 2014
Posts: 1,343
South Central PA
Correct, 7.5/7.625 10 bolt. If it was the 8.5 out of the V6 I'd have more options. Looking like the easiest and cheapest option is to keep the locker and replace the ring and pinion. I'm assuming all the bearings are in good shape.


'17 VW GTI 2.0T - 6MT - 11K - Edge 0w40
'15 Camry SE - 2.5 - 22K - PP 0w20
'99 S10 - 2.2 5MT - 157K - PP 10w30
Re: Rear End Swap Ratios? [Re: Delta] #4454460
07/09/17 03:44 PM
07/09/17 03:44 PM
Joined: Mar 2012
Posts: 1,372
San Antonio, TX
E150GT Offline
E150GT  Offline
Joined: Mar 2012
Posts: 1,372
San Antonio, TX
3.42's aren't enough? My truck has 150 hp and 2.73's. I ask because I want to make my swap someday and I was thinking 3.55's. Generally for around town its not a problem with the 2.73 rear end but when I go down to the coast and fight the headwind I have to downshift on flat road into 4th to keep pace. She aint quick by any means. My old 1990 ford econoline with the 4.9 and C6 3 speed and 3.08's felt much quicker and probably was.


1984 Mercedes-Benz 300SD - 100k
1995 F150 XL 4.9 reg cab 5MT - 251k 5w30
2016 Mazda6 Touring 6MT - 57k 10w30
2006 Buick Lucerne CXL 3.8 31k 5w30
Re: Rear End Swap Ratios? [Re: E150GT] #4454467
07/09/17 04:01 PM
07/09/17 04:01 PM
Joined: Apr 2014
Posts: 1,343
South Central PA
Delta Online happy OP
Delta  Online Happy OP
Joined: Apr 2014
Posts: 1,343
South Central PA
Originally Posted By: E150GT
3.42's aren't enough? My truck has 150 hp and 2.73's. I ask because I want to make my swap someday and I was thinking 3.55's. Generally for around town its not a problem with the 2.73 rear end but when I go down to the coast and fight the headwind I have to downshift on flat road into 4th to keep pace. She aint quick by any means. My old 1990 ford econoline with the 4.9 and C6 3 speed and 3.08's felt much quicker and probably was.


Hah, your inline 6 has torque. My old 2.2 4 banger, not so much. Sideling Hill and Tuscarora Mountain are anywhere between 9% to 12% grade for about 3 miles either way. I typically run 3rd gear around 45mph, but like I've said the engine is begging for mercy. I've done faster, but it will start to get hot. You can run it to about 52, shift into 4th but it won't hold speed in that gear. Not looking for a speed demon, but anything to help it along.


'17 VW GTI 2.0T - 6MT - 11K - Edge 0w40
'15 Camry SE - 2.5 - 22K - PP 0w20
'99 S10 - 2.2 5MT - 157K - PP 10w30
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