Towing on Highway with 4:10 differential

Towing on Highway with 4:10 differential

rockinreel

Jeeper
Posts
82
Thanks
0
Location
Midway, GA
Vehicle(s)
86 CJ7 Renegade
AMC360, Dana 300, T5 Tranny, Dana 44 rear, Dana 30 front, 3:73 lockers
I have an '86 CJ7 (258) with a 2:73 gear ratio, which is an open differential. Will be upgrading to a traction enhancing diff soon. I often tow a small trailer with a ATV on it and additional weight and can't use 5th gear while towing on the Interstate. So, I tow in fourth gear. I can use 5th without towing, as some people say they can't.

If I switch from a 2:73 diff to a 4:10, I'm concerned I may not be able to tow in 4th gear at 65 - 70 mph anymore and maybe not even in 5th with a 4:10. Will I end up towing in 4th at 55mph to keep the RPM's down, or will I be able to tow in 5th with a 4:10?

thanks
 
I have an '86 CJ7 (258) with a 2:73 gear ratio, which is an open differential. Will be upgrading to a traction enhancing diff soon. I often tow a small trailer with a ATV on it and additional weight and can't use 5th gear while towing on the Interstate. So, I tow in fourth gear. I can use 5th without towing, as some people say they can't.

If I switch from a 2:73 diff to a 4:10, I'm concerned I may not be able to tow in 4th gear at 65 - 70 mph anymore and maybe not even in 5th with a 4:10. Will I end up towing in 4th at 55mph to keep the RPM's down, or will I be able to tow in 5th with a 4:10?

thanks

:)You need to look at a Standard Gear & Tire ratio RPM chart like the one attached........that will tell you all you need to know

:D:D:D:D
 
Screw gear ratio charts.

32" tires, 2.73 gears, and Jeep T5 tranny at 70 mph:

4th gear = 2071 rpm, 5th gear = 1781 rpm

32" tires, 4.10 gears and Jeep T5 tranny at 70 mph:

4th gear = 3110 rpm, 5th gear = 2675 rpm

32" tires, 3.54 gears and Jeep T5 tranny at 70 mph:

4th gear = 2686 rpm, 5th gear = 2310 rpm

3.54 gears would be appear to be a better choice.
 
I assume that 5th gear is an OD? If that is true, 4:10 gears should be fine to about 70 mph with the 32" tires. I have 31" tires, 3.73 gears and high gear in my trans is 1:1 ratio engine to tranny output. At 70 mph my engine is wound out.
 
I assume that 5th gear is an OD? If that is true, 4:10 gears should be fine to about 70 mph with the 32" tires. I have 31" tires, 3.73 gears and high gear in my trans is 1:1 ratio engine to tranny output. At 70 mph my engine is wound out.

Thanks, rlitavecz, nothing like raw experience on the highway. With yours and csuengr' input, you've answered my question.

thanks
 

Jeep-CJ Donation Drive

Help support Jeep-CJ.com by making a donation.

Help support Jeep-CJ.com by making a donation.
Goal
$200.00
Earned
$110.00
This donation drive ends in
Back
Top Bottom
AdBlock Detected

I get it, I'm a Jeep owner and ad-block detectors kinda stink but ads are needed on this site. This is a CJ site, all the ads are set for autos (some times others get through.) I cannot make them just for Jeeps but I try.

Please allow ads as they help keep this site running by offsetting the costs of software and server fees.
Clicking on No Thanks will temporarily disable this message.
I've Disabled AdBlock    No Thanks