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Unread 01-07-2012, 10:19 PM   #1
hutch1200
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Dana 20 top speed

A buddy from H.S. is moving to Cali. He'll be running in sand dunes and beaches alot and we both had the same same set up back then. He still has the 304/T-150/AMC 20 T-case and AMC 20 rears w/3.73gears. We usually ran 33x12.50s. Although we never got to find out back here in the Pa woods, but what is the top end of this steup in 4-high? We never went much more than 35-50 mph in cold snow. No we're curious as to how fast he can rip across a semi low traction area for miles w/o burning something up in hot weather. He does have the dbl Cardan driveshaft in the rear, which he did when he did a total mechanical re-hab in 2006 (3,500 miles ago!). Not the most important question to come up, but he's afraid that 60 mph for 15 mins will seize the t-case in 4-hi...or something. I told him I knew some smart people who would know these things! Thanx guy/gals.

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Unread 01-07-2012, 10:26 PM   #2
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As long as everything in the drivetrain is in good condition, and the fluids are current and properly filled, I would say the limiting factor would be the topend of his Jeep's capability. I think the T-150 would be the weakest point of the whole thing. I don't think the AMC20 will cause any problems in sand with 33s.

To edit: It also has something to do with Murphy's Law. It is directly proportionate to how many guys are chasing him, and how badly he needs to get away!!
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Unread 01-07-2012, 10:40 PM   #3
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Semi Divorees

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Originally Posted by Skerr View Post
As long as everything in the drivetrain is in good condition, and the fluids are current and properly filled, I would say the limiting factor would be the topend of his Jeep's capability. I think the T-150 would be the weakest point of the whole thing. I don't think the AMC20 will cause any problems in sand with 33s.

To edit: It also has something to do with Murphy's Law. It is directly proportionate to how many guys are chasing him, and how badly he needs to get away!!
Yeah, that semi/sorta divorced woman will really test a vehicle and yer skills!
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Unread 01-07-2012, 11:22 PM   #4
nshefbuch
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FYI. It's not a amc 20 tcase but a Dana 20.

Never mind, I see you have it right in the title but not the OP. sorry
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Unread 01-07-2012, 11:48 PM   #5
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After a little google searching, 55 seem to be the norm for a number of different vehicles, altho these are mostly chain drive TC's, and the owners opinion. Its also not comparing apples to apples.

Probabley the most interesting thing I read was, "if your going 60 why do you even need 4wd" . this came from 2 different people in 2 different forums.

I should be interesting in the morning with the replys.

On edit, after 8 google pages, I couldn't find anything. This was probabley the best one. http://classicbroncos.com/forums/sho...d.php?t=105367


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Unread 01-08-2012, 01:54 AM   #6
hutch1200
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Thanx lucdog. I remember my dad, like people listen to them, saying 55 mph was top speed for any slippage on a t-case..... even q-trac.
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Unread 01-08-2012, 06:29 AM   #7
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In sand and other "loose" mediums, you can drive as fast as the vehicle will go without issues (provided the entire drive train is solid and well maintained). Guys running these systems have raced SCORE, and Baja for years with out any issues. Generally, I would be more concerned with an automatic transmission getting hot, but even that can be controlled with an aftermarket fluid cooler mounted on the radiator.
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Unread 01-08-2012, 12:08 PM   #8
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Thanx guys. My bud is at ease now. He had visions of tearing along and having /chains/gears ripping through the floorboards at him! But does anybody ever listen to me....well maybe he does have a few reasons.
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Unread 01-08-2012, 12:43 PM   #9
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Though not sustained, we've ran a 20 in dads Jeep for a number of years. Mid 70'sMPH for multiple passes at the dunes. Round and round it would go. In 4H, the 20 seems to be able to handle some abuse. From years on the dunes, my experience has been that you can only go as fast as your suspension allows. If the dunes you're at aren't completely flat all over, your limiting factor for speed will be your suspension.
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Unread 01-08-2012, 03:19 PM   #10
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He still has the Rancho 3" springs we both bought senior year w/new shocks in '06. He thinks he'll be trying to catch up w/Bo Derek on the beach. I just hope he's smart enough to keep it out of the salt! I forgot you ran that setip in your digger, thanx.
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