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Unread 02-13-2013, 06:20 AM   #1
NotThePainter
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1995 YJ Wrangler 
 
Join Date: Nov 2010
Location: Keene, NH
Posts: 339
Getting my YJ on 35s, 37s? Not sure I can...

I'm on 33s now and would like to be on 35s, 37s would rock but I really can't see the need.

So, what's stopping me? It is a 4 cylinder, Ford 8.8 in the rear, HP30 up front, upgraded with Yukon 1541H alloy axles. Gear to 4.88.

I can do 70mph on the highway but hills are a bit of a problem. And 55mph is much harder to drive than 65mph, the gearing in 5th is just too low unless it is level. I don't need to go anymore than 70, it just too loud and unpleasant.

Front clearance isn't an issue, I already have tube fenders with plenty of travel, rear is a bit of a problem, but lifting her another inch is acceptable, or I can raise the rear tubes a bit and cut some sheet metal away.

So, it seems to me that the engine and front axle are the problem. I guess the HP30 can take the 35s but with some risk. But I can't gear past 4.88 and the tiny 4 cylinder will have trouble with the extra weight and diameter of bigger tires.

Have I pretty much covered it or am I missing something obvious?

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Unread 02-13-2013, 07:28 AM   #2
bogleparsons
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There isn't that much more strain on the engine from 33x12.5r15 to 35x12.5r15.
I think the 35's with 4:88's puts you near stock ratio's.
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Unread 02-13-2013, 07:31 AM   #3
Ivonbenster
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The D30 can handle 35's just fine, as long as you aren't abusing her the limit consistently but 37's would be a issue for the D30 and even the 8.8 I believe but correct if I am wrong. I run D30 and 8.8 rear with 4.10 gearing and 35's. So far its been pretty awesome setup for me...though the roughest trails I have done are medium difficulty.
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Unread 02-13-2013, 07:38 AM   #4
Ripper3494
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Quote:
Originally Posted by Ivonbenster View Post
The D30 can handle 35's just fine, as long as you aren't abusing her the limit consistently but 37's would be a issue for the D30 and even the 8.8 I believe but correct if I am wrong. I run D30 and 8.8 rear with 4.10 gearing and 35's. So far its been pretty awesome setup for me...though the roughest trails I have done are medium difficulty.
The 8.8 is good for 37s. I have 2 buddies that run a rubi 44 up front and a stock 8.8 in the rear, one consistently runs at Moab and the other beats the piss outta hus with a v8 on slippery trails

I'd say beef up the front axle with some gussets, sleeves and good shafts and you should be good to run

Edit: above statement is for 35's 37s on a D30 isn't worth the risk

Probably sent from under my broken heep
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Unread 02-13-2013, 08:02 AM   #5
NotThePainter
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Quote:
Originally Posted by bogleparsons View Post
There isn't that much more strain on the engine from 33x12.5r15 to 35x12.5r15.
I think the 35's with 4:88's puts you near stock ratio's.
Oh, so I'm doing better than stock? Boy, what a pig then... :- ) Thanks!
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Unread 02-13-2013, 08:03 AM   #6
NotThePainter
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1995 YJ Wrangler 
 
Join Date: Nov 2010
Location: Keene, NH
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Quote:
Originally Posted by Ivonbenster View Post
The D30 can handle 35's just fine, as long as you aren't abusing her the limit consistently but 37's would be a issue for the D30 and even the 8.8 I believe but correct if I am wrong. I run D30 and 8.8 rear with 4.10 gearing and 35's. So far its been pretty awesome setup for me...though the roughest trails I have done are medium difficulty.
I don't mind "missing out" on 37s. It is just that some of the clubs I wheel with rate trail eligibility by tire size. There are trails I know I can do, and have done with other clubs, that I can't run since I'm on 33s. Go figure...
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