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Old 09-15-2006, 08:24 AM   #1 (permalink)
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Exclamation 4.10 and a 4 speed

Hace a 80 cj-7 with 33 MTR's looking for anyone running the dana 30 and amc 20 with 4.10's and 33 or 35's or any tire for that matter with a four speed. I need to know if hightway use is still an option I have checked with the gear to tire calculator that tells what rpm at 60mph. I have got numbers from 2700 to 3200. Is this two much for the 258. This jeep is not a daily driver but does see the higheay to travel to trails. I am considering 35 MTR at a latter time but the 33 are brad new. I would like some feed back from anyone running this set up even if it is in a 5speed. thanks ep
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Old 09-15-2006, 12:31 PM   #2 (permalink)
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speed

no problem for years, just do not plan on going 70mph

258,T18, klun,d300, d30/arb,amc20/with fullfloat detroit. 33in for years now 35 need lower gears.
want to buy two well set up axles?
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Old 09-15-2006, 12:32 PM   #3 (permalink)
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Dito here. Great for Offraod but not so great on fuel. 60 to 65 is what I do max.
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Old 09-15-2006, 12:51 PM   #4 (permalink)
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Thanks guys, I have not yet bought the parts and I guss you can't have the best of both worlds. what rpm does your 258 run at 65 and I wonder how 373 would do with 33's, ep
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Old 09-15-2006, 06:34 PM   #5 (permalink)
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gears

you will burn up your clutch, to tall of a ratio
33in tires call for 4.10 or higher numbers
not sure of the rpms but not all that wild, looking to go 4.56 maybe 488? running 35in tires. not a dd.
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Old 09-16-2006, 09:30 AM   #6 (permalink)
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I had a CJ with 4.10s for years and had 33s on it. You won't burn up your clutch. You can run it as fast as you want on pavement except above 60 mph the gasoline can get expensive.
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Old 09-16-2006, 09:51 AM   #7 (permalink)
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In my opinion (whatever that's worth) 4.10s/33s/5spd is a great setup for a rig that is driven to the trail. Driveability is very close to stock.
I ran this setup for a couple of years before going V8/auto- now I kinda wished I had kept the 5spd for the OD.
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Old 09-16-2006, 11:38 AM   #8 (permalink)
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I ran 4.56 T-18 32's for years and hated the 4-5hour drive to the trail head. In fact I hated being on Callifornia Freeways period.
I went to 35's and it was ok. I'm now going to 4.10's and later I'll install a 4:1 in the D300.
Like I said my 4 speed is a T-18, so the granny is not used at all w/4.56 on the street. And the 2nd is barely needed with 4.56 on 32's. In other words I basically had a 2 speed on the street.
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Old 09-16-2006, 07:54 PM   #9 (permalink)
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A buddy had a '80 cj7 with 4.10s and 33s. Drove it all over (many trips across nevada at 70-80mph) but had a header, 4 barrel, and cam in the six. The stock motor doesn't like turning 3 grand too much. I had a cj7 with 4.10s and five speed on 33s and stock 6cyl and that was nice on the road but pretty gutless. I think 35s with the 4.10s is a better combo than 33s but I'd rather have 4.10s planning to go to 35s than need to change gears again when I went to 35s.
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Old 09-18-2006, 03:23 PM   #10 (permalink)
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4.10's and 4 speed

Thanks to all who replied, I have decided to go with the yukon 4.10 gears and one piece axles I think this will still give me some streetabilty, This jeep is not a daily driver so I can stand alittle hit at the pump. I'm also insalling an Aussie locker in the rear. I have already installed a hedmen header, 36dg Weber carb, and comp cam. I am going through the complete jeep this winter. This is a great site for info. ep
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