Author Topic: t/case weak link? (Read 2417 times)

VueDoo · « **on:** Feb 07, 2004, 02:04:25 PM »

What would be the weak link in a marlin 4.7 21 spline single case? input shaft, output shafts, gears, the case itself, other? Are 4:1 gears still avail? are they stronger?
I'm wondering what will break with a V-8, sm465, d60, 14b, 42" swampers, and a idiot driver

I think a 205/203 doubler might be strongest, but a toy case is going in.
Thanks, Phil

84runner · « **Reply #1 on:** Feb 09, 2004, 12:16:15 AM »

If you can go with the 23 spline do it

VueDoo · « **Reply #2 on:** Feb 10, 2004, 01:00:50 PM »

Is the input the weak link?

Marlin · « **Reply #3 on:** Feb 10, 2004, 10:51:52 PM »

Quote from: VueDoo on Feb 07, 2004, 02:04:25 PM

What would be the weak link in a marlin 4.7 21 spline single case? input shaft, output shafts, gears, the case itself, other? Are 4:1 gears still avail? are they stronger?
I'm wondering what will break with a V-8, sm465, d60, 14b, 42" swampers, and a idiot driver
I think a 205/203 doubler might be strongest, but a toy case is going in.
Thanks, Phil

As long as the input is a Japanese made total spline gear, the rear output shaft would be the weak link. We have never had a input failure! Running a V8, granny box, and big tires, and if the gears are my old americian design, we had many failures (just one of the reasons I finally choise to go with the orginal gear cutter) and the 4:1 AA gears break even easier? I think the 4:1's are made from a less expensive material? I would advise using a 81-85' output shaft and polishing it at the ruff area just in front of the front output splines.
Do your best to keep the buggy as light as possible. This will put less stress on the drivetrain.
Let me know if you need a polished output shaft.
Why are you still running a 21 spline input? You know you should be using a 23 spline input

Marlin

VueDoo · « **Reply #4 on:** Feb 11, 2004, 01:07:54 PM »

Thanks Marlin, thats the info I was looking for. This is for a different project, not the comp buggy. If the rear output is the weak link with a total spline 21 , then would there really be any advantage to a 23 spine other than piece of mind?

Marlin · « **Reply #5 on:** Feb 11, 2004, 10:07:27 PM »

Quote from: VueDoo on Feb 11, 2004, 01:07:54 PM

Thanks Marlin, thats the info I was looking for. This is for a different project, not the comp buggy. If the rear output is the weak link with a total spline 21 , then would there really be any advantage to a 23 spine other than piece of mind?

You are correct Phil :bowdown:The only other reason is that the larger 23 input has more surface area, so there would be less spline wear thur the years.

MC