4L60E w/ 2.41 rear

[Pettrix]

Torque multiplication is provided by your axle gears.

For example, let’s assume that the engine is delivering 100 lb-ft of torque to the pinion gear. If the gear ratio of the ring-and-pinion is 4.10:1, then the output torque is 410 lb-ft (100×4.10). Now if the gear ratio is 2.49:1, then the output torque will be 249 lb-ft. when in a 1:1 ratio in the trans.

The 4.10:1 gears put way more torque & power to the ground than the 2.49:1 gears. This will accelerate the vehicle faster without modifying the engine.

 

[Tomeal]

Gotcha, I'm 20' up a tree, freezing!

Just killing time, brain slows down!

 

[Tomeal]

Correct, what Jared was referring to was that I have the entire 2wd blazer that’s giving up the engine and trans (among other parts), and was suggesting using the gears as well....

See what I mean, forgot the quote!

 

[Texas82GP]

Aren’t the axle splines a different count, and axle shafts different lengths?

I think you are right, together with compatibility of a 3 series carrier with your 2 series housing. I was thinking swap the ring and pinion and go with the GN replacement axles. Would probably be less expensive to just source another 7.5 with a better ratio like 3.42 or 3.73.

 

[Oldcoyote]

Why did you choose a 4L60?

 

[Wageslave]

It is probably worth mentioning that with 2.41's and a deep .70 overdrive together, you are going to be running some stupidly low RPM's at 55.

I had a setup with factory 14" tires, 2.73 rear gears and a .83 overdrive gear. This would run about 1350 RPM at 55. With your setup, you might be looking at 1150 RPM at 55.

Needless to say, a 4.3 doesn't make much power at that RPM and will use a crapload of fuel trying to hold speed.

 

[Lowdollarbuild]

How's it gonna drive real world? Is the gearing going to be weird and annoying to drive?

It would most likely be behind an Ls, but not ruling out a vortec.

Or should I leave th200/th350?

Not a big difference in 1st 2nd & 3rd gears between those transmissions. Transmission temps will be higher in stop & go driving with that differential gearing.

 

[64nailhead]

I think you are right, together with compatibility of a 3 series carrier with your 2 series housing. I was thinking swap the ring and pinion and go with the GN replacement axles. Would probably be less expensive to just source another 7.5 with a better ratio like 3.42 or 3.73.

There are other ways to accomplish this as well, but the using GN axles in the Blazer 28 spline diff works. I've used stock 2WD S-10 axles by adding a 5/16 space plate between the brake backing plate and the housing flange. Also, Moser will make a set of axles for you that will exponentially stronger than anything stock, including the GN, for less than $300. With an upgraded axle, then weak lik will definitely be inside the carrier at the pinion bearings.

As mentioned many times in the past, the stock 7.5/7.625 doesn't get much love from the high HP community, but to daily drive and not launch with sticky tires it will work just fine in sub 500HP applications - AND THEY ARE CHEAP to fix if needed.

 

[fleming442]

Gotcha, I'm 20' up a tree, freezing!

Just killing time, brain slows down!

Ya know they sell meat in the grocery store, right?

 

[melloelky]

Ya know they sell meat in the grocery store, right?

yes but a trip to the market can't kill nearly as much time away from the Mrs compared to sleeping in a blind for a few days..