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Old 11-18-2009, 04:28 PM
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Running th-350 in 2nd gear?

Well to get a little backround I put a 402 BB chevy in my 79 Malibu. The car has a th350 trans and 2.29 rear gear in a 7.5 rear (know it will explode the rear is just temperary along with the th350). What I would like to know is will the trans make too much heat if I leave it in 2nd gear out on the road. The motor doesn't like to turn that slow and the exhaust drones like crazy with it in drive at 60. And I know I'll get alot of that motor should pull just fine that slow but it TEMPORALLY has a tunnel ram on it as it was in a different project before.

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Old 11-19-2009, 02:52 PM
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Almost 24 hrs and noone has any input?
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Old 11-19-2009, 03:01 PM
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It won't immediately hurt anything if the trans is in good shape, but it will wear out the trans faster. Short track circle trackers do this all the time in Bomber or Street Stock classes that rules require a stock rear axle that nobody makes a low enough gear set for, such as the 7.5" GM 10-bolt. As long as the car has a decent trans cooler and you can live with the rpm being turned you can do it.
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Old 11-19-2009, 04:02 PM
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Doing the math it only turns about 2700 at 60. So that's not bad. Like I said this is a temperary thing. Thanks
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Old 11-19-2009, 05:44 PM
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trans makes alot more heat when in any gear other than high, so get the best cooler you can fit on the car. and dont get one that is just a tube snaked through some fins, they dont work. get a flat plate Long-style cooler like comes on a late model GM truck.
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Old 11-19-2009, 05:56 PM
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Yep, flat Plate type coolers are much more efficient than round Tube & Fin type.
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Old 11-22-2009, 09:53 PM
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I've got a question that goes along the 2nd gear thing.
I have blown 350 sbc and T-550. I use a Lokar shifter (bought before I knew better). The trans has a shift kit that allows either manual or auto shift depending on where the shifter is. The car is really light at 2800 lbs with me in it.
The problem is that it is nearly impossible to manually shift from 1st to 2nd before I run out of rpm (6000 rev limit) I doubt if it is 3 sec and 60 mph. You can easily over shift the shifter. 2nd to 3rd is doable but you have to be cool and move the lever exactly at the right time and just a little movement.

It works best to set the shifter in 2nd and make the start letting the trans shift automatically at about 4200 rpm. Then gently start the shift to 3rd at 5000. Performance wise there isn't much if any difference +/- 500 rpm. The shifts are firm and very quick. The car can get loose at the 2-3 shift at times.

Now I'm told that it is hard on the trans to allow the auto 1-2 shift as opposed to the manual shift due to different oil pressure paths. Is this true??
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Old 11-22-2009, 10:01 PM
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The governor can be modified to shift at almost any rpm,if left in drive.
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Old 11-23-2009, 01:59 AM
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Never heard of a problem allowing the trans to Auto shift. As SDLuck mentioned, you can get a Governor Recalibration Kit to raise, lower and fine tune shift points>> http://www.summitracing.com/search/D...?Ns=Rank%7cAsc
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Old 11-23-2009, 06:29 AM
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I'd say get a better shifter, the Lokar is the pits for any kind of manual shifting, as you have found out. I can't believe they have sold so many of these things as they have as vague about what gear they are in that they are.
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Old 11-23-2009, 06:52 AM
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I know, slap my hands I didn't know any better when I got this thing. It's like blonds, they look pretty but are functionally useless. haha

I did get a pattern for a modified shift detent from one of the guys here. I just haven't installed it yet. It has gates for the manual shifting and will prevent overshifting. It's not very heavy duty because of the Lokar design but if you are gentle with it, it will work. I also got a Lokar replacement gate plate to mount the new one on but I just haven't had time. We've had some unusually warm weather and I've really taken advantage of it.

Thanks for the governor information. I knew they were around but not where to get them.

Thanks
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