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Old November 30th, 2007, 09:37 AM   #1
88yj
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Default Motor Mounts and Dual Cases

What are you guys with dual cases running for motor mounts? I know some guys rig up a chain system to keep the motor mounts from cracking under the extra torque, but I'm wondering if there are any bolt-in solutions that use stiff enough material to live with dual cases.

I'm going to run these mounts for the tcases and each case will be mounted to the skid.

Or if I'm too worried about nothing and stock mounts should be fine, let me know.

Thanks.
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Old November 30th, 2007, 09:57 AM   #2
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I have never had motor mount problems with dual cases. So the answer is, I have done nothing.
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Old November 30th, 2007, 10:15 AM   #3
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What gearing do you run in the tcases? I'm planning stock up front and 4.70 in the rear.
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Old November 30th, 2007, 10:48 AM   #4
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Two stock cases. I thought about going lower in the rear, but I am happy with 108:1 (5.29 axles)
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Old November 30th, 2007, 11:42 AM   #5
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I'm not quite happy with my stock low range and 5.29 gearing. I'm thinking I'll run around in 4.7:1 most of the time and just not use first gear. I've also considered changing to 4.88 gearing to go with the 4.7 case, but I haven't checked to see if that'll get me where I want to be on the highway for rpms yet.
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Old November 30th, 2007, 11:58 AM   #6
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You could just set it up with daul stock cases and if you don't like it, order gears for the rear case. I doubt you will want anything lower then 108:1, esp for wheeling with 10 hours of here. If you wheeled moab all day every day, you might want lower.
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Old November 30th, 2007, 12:14 PM   #7
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The good news is the cases aren't going in tomorrow, so I've got some time to think about it.
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Old November 30th, 2007, 12:29 PM   #8
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I ran a 4.7:1 single case in my 4runner. I later changed to dual cases in my next build. I prefer the dual cases, as you can run stock low range (even though you mostly dont) I use it for transporting between trails and on trails that are ghey lol.

If you did regear the rear case, you could have 3 low ranges. Stock, 4.7:1 and 10:1. I guess that would be worth while if you had the extra $$ with nothing else to do :)
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Old November 30th, 2007, 03:37 PM   #9
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I played around with a gear ratio calc and I almost think a 2.28 case and a 4.0 case with 4.88 axle gears would be ideal. I'd like to run around in 4.0 most of the time and just add the 2.28 for rocks. The main advantage I see to dual cases is the 3 low range options.
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Old November 30th, 2007, 09:03 PM   #10
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found this on POR:

Quote:
Originally Posted by 4RnrRick
Yes you can blow a clutch by freewheeling it in 2.28 X 4.70 gear (I call it triple low) and coasting the vehicle down something. I was with Chass, when it happened to him. It makes a prety cool sound when it blows!

Sounds like broken glass. Been there, done that.. Low-low-1st will blow most clutches when you drop down a steep hill, esp. if you push the clutch in. Best thing to do - don't pull the transmission out of gear and into neutral, pull one the transfercases into neutral.
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Old December 1st, 2007, 07:00 AM   #11
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Yeah, I learned about that problem in Moab. I'd love to find a hill around here where stupid low like that would be worth anything.
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Old December 1st, 2007, 09:09 AM   #12
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Daryl did some calculating, the clutch disc would spin at 18,000 RPM's. No wonder they blow up :o
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Old December 1st, 2007, 11:25 AM   #13
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I also run stock mounts with 2.28 x 2.28 x 4.88s..

But I run a front range center section in a custom t-case crossmember, which handle a lot of torque load.

I know there are times I'd like more than the 100:1 I have, but my next build will probably be just a single 4:1 t-case, for space reasons...
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Old December 1st, 2007, 05:12 PM   #14
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I'm going with the crossmember Marlin is selling now with dual tcase mounts.

I'm fairly certain I want a 2.28 x 4.0 x 4.88 combo for a better number of useable gears and a spread of ratios that will fit east coast wheeling best. I'm going to keep my axles 5.29 until I put the new cases in though just to make sure I don't waste money regearing if the 5.29s keep me happy.
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Old December 1st, 2007, 08:04 PM   #15
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Quote:
Originally Posted by 88yj View Post
I'm going with the crossmember Marlin is selling now with dual tcase mounts.

I'm fairly certain I want a 2.28 x 4.0 x 4.88 combo for a better number of useable gears and a spread of ratios that will fit east coast wheeling best. I'm going to keep my axles 5.29 until I put the new cases in though just to make sure I don't waste money regearing if the 5.29s keep me happy.
The 4.88s are my axle gears, so if you already have 5.29s, you don't need 4.88s... (I run mine because I got both for free..)

4.0 gears are only available from AA.. why not 4.7s from Marlin?

In either 1st or 2nd low range, I never really use 4th or 5th gear. With 4.0s or 4.7s, there still a bit of overlap between low and high range.

My setup will eventually be a 4:1 dana 300, which unlike a Toy case, can be clocked and do front digs.
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Old December 1st, 2007, 08:33 PM   #16
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I think the 4.88s would be better for highway driving with 35" tires. Right now I rev too high going 65 mph and I'd like to get 70-75. Part of that may be my craptacular 22r and swapping to a 22re might make me happy with 5.29s. I really want to be able to drive to the trail if I'm not staying there over night.

I think I'd rather have 4:1 as basic low range. I don't need to go much slower than I am right now for general trail riding, but 2.28 is too fast and I think 4.7 would be slower than I want. I think 3.xx is my ideal low range for general use, but I don't know of anyone making 3.xx gears for Toyota tcases.

I'm not concerned about clocking the case since 35s give me about as much belly clearance as I need. I may eventually do a rear driveshaft disco so I can have front dig ability, but it's more likely I'd run a rear e-locker and cutting brake.
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Old December 1st, 2007, 08:50 PM   #17
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Heh, if you want 4.88s, I'll do a trade with ya... I have 38.5s and barely can even use 4th gear... My motor is pretty weak, though.. I can't do better than 55 - 60 flat out...

Yep, no one makes those ranges.
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Old December 23rd, 2007, 02:53 AM   #18
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If I remember right Rockstomper.com makes aftermarket poly motor mounts. about $75 I believe, you can try punching that in or looking in the links on pirate 4x4. I dropped the clutch hard enough to tear both stock mounts. (yes, driver and pass. sides) probably partly due to old motor mounts, and me being rough on shit. so I welded in a length of chain from the frame to the mount and I replaced both of them with another set of old motor mounts that were lying around. I then built a transfercase mount with some poly yj leaf spring bushings. haven't had any problems yet, still rough on it, even made it through a trip to the badlands. most likely a good idea to have both poly motor mounts and t-case mounts. I have seen people do one or the other and break bell housings. but if the chain is tight enough it will most likely be alright. my 2 cents

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Old December 23rd, 2007, 03:09 PM   #19
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LC Engineering offers some:

http://www.toyotacatalog.net/M1WebGe...spx?Class=1369
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Old December 26th, 2007, 05:52 PM   #20
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I run 2.28 x 4.7 x 4.10, and even with 2 V-6 tcase mounts i had to chain my motor mounts to keep them in one piece. Been working fine for a couple years for me.
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