anyone running 700r4 with 3.55or 3.77 rear end? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 01-04-2003, 08:03 AM
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Post anyone running 700r4 with 3.55or 3.77 rear end?

is anyone running a 700r4 with 3.55or 3.77 rear end .at present i have a 350 tranny with 3.07 rear end gears, but it seems to lack acceleration my rear tire size is 255/60 15.
i am about to purchase a 700r4 tranny from the usa but the supplier (reputable) has recomended not to use the 3.77 rear end gears as he feels this would be to aggressive with 26"tall rear tires, but looking through street rod magazines most street rods seem to be using 3.55/3.77 rear end.
can any one help?i would like to at leastleave tire marks on the road on a hard acceleration as well as have the overdrive facility

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Old 01-04-2003, 01:53 PM
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Right now, I am running a 700R4 in a 36 Ford coupe, behind a 300 HP 327 and a 3.08 rearend. If I really tromp it, I can squeal the tire (no posi), but I love the 80 mph cruise and 21.5 mpg. I had a 700R4 in my 36 Ford PU with a 3.36 rear, better than stock 355 motor and with the light rear end, how much rubber did you want to leave in first and 2nd gear? Your 37 Chev should be comparable to my coupe in weight, so figure how much rubber you want to burn cause your wide tires don't have much of a foot print (pounds per sq inch) and the firs gear in the 700R4 gives you a lower first gear over the TH 350. Almost like putting in a 3.55 rear. It is probably better to make this a 2 step project. Step one: Install the 700R4 and drive the car with the present rearend. If it is not what you want off the line, then go up on your numerical rear end ratio. Your RPM at 60 MPH cruise with your tires and 700R4 will be near 1800 with 3.36 gear and 1900 with 3.55 gear.

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Old 01-04-2003, 02:06 PM
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Excellent idea trees. Swap the trans first and see how you like it. Then you'll really know if you want just a little extra umph or a lot extra.
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Old 01-04-2003, 05:00 PM
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37 Chevy, I have used the 700r4 with gear ratios as deep as 4.11. It is comparable to a Th350 with 3.55's. At this time, I am running 3.42's in my Firebird and 3.73's in my S-10, both have 700r4 trannys. My Firebird is running 295/50/15 tires and it cruises down the interstate flawlessly! 2000+ rpm's at 70. LOTS of giddy-up off the line, Lots of top-end. I haven't driven the S-10 much except for using my new goodrich's to repave the road in front of my house! Anyway, go with the 700r4, and some deeper gears (I would suggest 3.42 if you do alot of cruising) and have a BLAST. The best of both worlds, Speed and Acceleration!
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Old 01-05-2003, 03:22 AM
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Hi 37 chevy,my model a cpe,rear tire are 315/70/15's alittle over 31 inches tall using 4:56 gears 700r4,alittle slow off a standing start but at 65 around 2200 rpm.As mentioned try the trans first,then the gears you will have fun with anyone of the combinations especially the first two gears
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Old 01-05-2003, 04:02 AM
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with a 3.73 rear end your gear ratio in first wil be arround 12:1 which might be a little high for a 26 inch tire, also your cruicing rpm will be about the same (a little lower) in OD with the 700 and 3.73 gears as with a 350 and 3.08 gears now. But you will most definately be able to leave black streaks.

if i were you i would compromize and install a 3.52:1 rear ratio that way you both drop your cruicing rpm copmaired to now and get much better off the line pull..
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Old 01-06-2003, 05:44 AM
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THANKS FOR ALL OF YOUR REPLYS TO MY REAREND /TRANNY QUESTION I HAVE DECIDED TO GO FOR 3.54 REAR END AND STILL INSTALL THE 700R4.I HAVE STARTED ALREADY WITH THE RAER END AND WILL HAVE TO WAIT ABOUT 5-6 WEEKS FOR THE TRANNY TO ARRIVE FROM THE U.S.A.
YOU GUYS DONT KNOW HOW LUCKY YOU ARE TO HAVE EVERYTHING AT YOUR FINGER TIPS!!!!!!
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Old 01-06-2003, 06:34 AM
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I'm installing a 200R4 in my '53 Chevy pu with a tricked out 235 engine and 3:54 rear end.
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