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Old 09-22-2006, 12:00 PM
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700r4 or th350 which is quicker.

Hi i currently run a tri chevy 406ci small block with a th350 and 2000 stall converter. 3.73 rear gears. the best it has run is 13.20. at 104mph

I have the chance to swap to a 700r4. i know the gear ratio's are better for acceleration. and the overdrive will given me better mpg when cruising.

My question is how much do u think i will gain on the 1/4 mile. i plan to use a stock converter. aslo should i wire the converter to lock in all gears or just 4th.

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Old 09-22-2006, 12:08 PM
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In your case, the gear ratios for the 700R are not better than the TH350 for acceleration. You will loose time because of a huge gap between 1st and 2nd in the 700R.

The 700R was designed to get heavy, 3.08 geared, under powered cars moving off the line. That is why the first gear is so so low. The only good thing about the 700R transmission is the OD. And no, just lock it up in 4th.
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Old 09-22-2006, 01:06 PM
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What 454c10 said about the gear spread is correct BUT, if your motor puts out enough torque it shouldn't be an issue. I think your 406 would do fine with it and you will enjoy the rpm drop when locked up in 4th.
Mark
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Old 09-22-2006, 01:19 PM
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You get what you pay for in a converter, so don't go cheap. If you wire it so you can lock it up in any gear you can greatly increase the efficiency at the top end while taking advantage of the stall speed at the low end. My tow car went from 11.9's @ 114 to 11.7's @ 117 by locking the converter in third.
This feature will far outweigh the discrepancy over the gear ratio spread, and you get the OD to boot.
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Old 09-24-2006, 03:14 AM
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700r4 or th350

THanks for the advise.
Will the 700r4 be ok stock i was thinking of just fiiting a shift improver kit. convertor was also going to be stock as i tow a Caravan (trailer) to sleep in when i go racing.
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Old 09-25-2006, 05:09 AM
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What year is the trans? How many miles? Longevity depends on how it was treated in it's first life and how you treat it in it's second. A GOOD trans cooler will be a necessity if you are towing with it. A shift kit will help and I will make the suggestion to have it looked at by a shop before you put it in. It may cost a few dollars but better clutch packs and a good cleaning wouldn't hurt anything...
Mark
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Old 09-26-2006, 01:42 AM
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700r4 or th350

the 700r4 was rebuilt about 2000 miles ago the govener siezed . the pressure reg valve cam was hanging off when i dropped the pan. inspecting the clutches they show slight blackening but seperation steel plates are not burnt. was going to just clean the box up and reassemble it. what causes the govener gear to sieze should i slot the govener hub to allow better lubrication. to stop it siezing again.
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