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Old 01-09-2011, 05:02 AM   #1 (permalink)
turbosuzi
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ranger or gear vendor

I tried to install a ZF6 tranny last summer and it turns out to be almost impossible due to the 19 spline out put shaft, anyways... I installed a NV 4500 instead and now, being that I live in the foothills of the sierra nevada, the gear spacing between 2 to 3 and 3 to 4 is a little farther out than is comfortable. My thought and question is about adding an overdrive to my nv4500? Do you guys thinkthat the 5th gear inthe 4500 is strong enough to act as a 4th and 5th gear. I am thinking if I install a ranger/gearvindor and 4.88 gears that would give me a normal 5th gear while in the ranger OD while the lower gears would bring my shift points closer while the OD is off. Is that too much work on the 4500's 5th gear?
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Old 01-09-2011, 05:32 AM   #2 (permalink)
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how big are your tires and whats your ratio? it still tall gears for the original th400?
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Old 01-09-2011, 05:58 AM   #3 (permalink)
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The tranny is a nv4500 not a th400. the tires are 265/75/16 and the gears are 4.10's. I was thinking that i could turn it into a 6 speed but use axle gears to bring it back to the stock 5th gear ratio with the OD on.
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Old 01-09-2011, 04:21 PM   #4 (permalink)
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Sounds to me like you'd be best off with a Ranger underdrive splitter and the current axle ratio. Split each of the five in the NV4500 with under-direct and you'll have ten forward ratios. 1 Under, 1 direct, 2 under, 2 direct, 3 under, 3 direct, 4 under, 4 direct, 5 under, 5 direct.
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Old 01-09-2011, 04:32 PM   #5 (permalink)
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The Ranger is a nice set-up, just bolts in front, but last we checked they did not yet offer anything other than a second stick to shift. We discussed modding a switch on the main shifter for simplicity.
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Old 01-09-2011, 04:41 PM   #6 (permalink)
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The Ranger is a nice set-up, just bolts in front, but last we checked they did not yet offer anything other than a second stick to shift. We discussed modding a switch on the main shifter for simplicity.
It wouldn't be hard at all to set something up. When I was considering the SM465/Ranger OD, I was thinking about an air actuator to shift the Ranger and a cable operated control valve. Put a simple lever below the knob and route the cable to the valve. Many other ways to do it too. Vacuum, electricity, there are a number of options.
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Old 01-09-2011, 08:37 PM   #7 (permalink)
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Let's just say I have a grudge with ranger overdrives since I sold one to a friend years ago and it burned up within several hundred miles and advanced adapters wouldn't make it right. Cost me a friend, because I couldn't afford to eat the cost of the unit, especially since I sold it to him at cost. That being said, when my dad wanted an overdrive after I swapped in a sm465 to his 83 suburban, I got him a milemarker overdrive, it started life as a doug nash, then milemarker and last I knew US Gear. This was a great unit. It mounts between the tranmission and the transfercase, has an electric shift motor just like a 2 speed rear axle. For what it costs however, a turbo would solve your power issues and you wouldn't need to downshift. I used to run a 6.2 with a turbo with 4.10's and a nvg 4500 with 35 inch tires and I never had any issue with power. Then I upgraded to a 6.5 and it was even better. Last trip I made in CA was when I left for good back in 97 and my truck trailer was 23k gross and I pulled Donner at 45-50
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Old 01-09-2011, 08:47 PM   #8 (permalink)
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Let's just say I have a grudge with ranger overdrives since I sold one to a friend years ago and it burned up within several hundred miles and advanced adapters wouldn't make it right. Cost me a friend, because I couldn't afford to eat the cost of the unit, especially since I sold it to him at cost. That being said, when my dad wanted an overdrive after I swapped in a sm465 to his 83 suburban, I got him a milemarker overdrive, it started life as a doug nash, then milemarker and last I knew US Gear. This was a great unit. It mounts between the tranmission and the transfercase, has an electric shift motor just like a 2 speed rear axle. For what it costs however, a turbo would solve your power issues and you wouldn't need to downshift. I used to run a 6.2 with a turbo with 4.10's and a nvg 4500 with 35 inch tires and I never had any issue with power. Then I upgraded to a 6.5 and it was even better. Last trip I made in CA was when I left for good back in 97 and my truck trailer was 23k gross and I pulled Donner at 45-50
I did look at the US Gear some time ago, but someone said it was no longer in production. That led me to the Ranger. Anything to get away from the GV.
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Old 01-09-2011, 09:13 PM   #9 (permalink)
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The nvg4500 is a great tranny behind one of these engines, all the gears are supported with roller bearings, unlike the old sm465 that just used bushings. With heavy loads, I used 3rd gear a lot and 45 was very comfortable with 35 inch tires.
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Old 01-09-2011, 10:47 PM   #10 (permalink)
turbosuzi
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I have a turbo that will be going on soon but it seems with lag and driving in the foot hills that closer gears would be even better.
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