Topic: Is there a Max RPM for 4.7 gears?

[GRM]

I've been trying to figure out why my transfer case pukes fluid out the top of the shifter holes when driving on the freeway. It is fine at low speeds, just when I am running over 3200 rpm's in 5th gear on the highway.

The truck is an '86 mini, 22re, w56, dual ultimate, with 5.29 axle gears and 35" tires.

So far to help fix this leak I have replaced:
Shifters
Transfer Case Rebuild
Transfer Case Housing
Transmission Output Seal
Dual Case Adapter (inchworm to marlin)
and also swapped from 21 spline input 4.7 to 23 spline

The other issue I thought was strange (which spurred the rebuild) was that the pocket bearing on the input shaft was bone dry.

What makes me think it is an over-rpm issue is because I had the 4.7 transfer case in my old 4runner with 4.10 gears and 35's, with no leaks.

So my question: Is there a maximum operating rpm for 4.7 (or 2.28) transfer case gears?


Thanks for the help.

[OOPS]

Not that I know of. Do you have these under your T-Case shifters?

[emsvitil]

Not that I know of. Do you have these under your T-Case shifters?

the lip goes down...............

[79coyotefrg]

I drive my truck at 80 mph on the interstate all the time and  its never leaked at all.  of course its a Marlin Crawler built tcase with all Marlin Crawler parts.

[jrock]

I can't say for the 4.7s but my duals are running around 3-3500rpm on the highway. 5.29s and 33s. No leaking from anywhere.

[Dr.Maxwe001]

its a Marlin Crawler built tcase with all Marlin Crawler parts.

 
gotta love the marlin parts

[OOPS]

the lip goes down...............

I know, picture is from Marlins web page.

http://www.marlincrawler.com/hardware-tools/hardware/oil-slinger