kirk280zxv8 Posted December 6, 2009 Share Posted December 6, 2009 I have th-350 tran with no overdrive and no top end i either need 700r4 oe 336 rear end let me know what i should do . i just finished v8 conversion or so i thought please help me with any pointers. Quote Link to comment Share on other sites More sharing options...
Pyro Posted December 7, 2009 Share Posted December 7, 2009 I have th-350 tran with no overdrive and no top end i either need 700r4 oe 336 rear end let me know what i should do . i just finished v8 conversion or so i thought please help me with any pointers. 3.36 is a 180R which is a little weak for a v8, plus not much better gear ratio than a 200r 3.54 (stock 75 to 78 diff) 7000 rpms with 3.54 will get you to 140 mph. Maybe you just need a bigger cam. A bigger cam will make the engine feel smoother at higher rpms. I helped fab a 2.87 gear (1980 vette diff) in to a 77 Z. The taller gear made the car feel heavy. your better off with adding an OD (700r) than dropping the gear ratio. A GM T5 (5 spd manual) from a V8 camaro would be a better choice than a 700r. A z should have a manual trans (imo). I ran a 700r in my V8 conversion then later switched to a T5. I enjoyed the T5 much more. if you run a 700r, make sure to setup the TV cable correctly. Quote Link to comment Share on other sites More sharing options...
dr_hunt Posted December 7, 2009 Share Posted December 7, 2009 I agree with the z as far as going 5 speed, but then he has to get flywheel, clutch, clutch pedal installed, etc, etc, etc. Probably not a cost effective route. The 700r4 isn't all that great of a transmission in stock form IMO, but it works if the motor is pretty stock. I have one in my z with the 4.3L. They really make a big difference in cruising on the highway. Quote Link to comment Share on other sites More sharing options...
jay260z Posted December 7, 2009 Share Posted December 7, 2009 they have a r200 with a 3.36 ratio but its not a common ratio, i konw this because i just took it out of my car. Quote Link to comment Share on other sites More sharing options...
kirk280zxv8 Posted December 7, 2009 Author Share Posted December 7, 2009 i had a 5 speed with the 2.8l and took most of the stuff off so ill try to get a 700r4 or a 5 speed building on a budget here but thanks for the pointers Quote Link to comment Share on other sites More sharing options...
jhm Posted December 7, 2009 Share Posted December 7, 2009 Kirk- If you decide to stick with an auto tranny, check out the 200-4R. While many people may prefer the 700-R4, it will require a driveshaft mod (the 700-R4 is longer than your TH350) and has a different gear spread than the 200-4R....which may or may not work well for you.....depends on your goals for the project. The 200-4R was popular in 1980's Chevys and Buick V-6 turbos, if you decide to go looking on Craigslist or other auto websites. Check out Bowtie Overdrive's website...they have a ton of good tech info for someone considering automatic overdrive transmissions. http://www.bowtieoverdrives.com/index.shtml Good luck and happy motoring. jhm Quote Link to comment Share on other sites More sharing options...
kirk280zxv8 Posted December 8, 2009 Author Share Posted December 8, 2009 Today i adjusted my shift points because of shifting to early. but 3000-3500 rpm guess at about forty mph in 3rd i think still not much top end. Tomm ill let my boss drive and see what he thinks. He was the one that told me about the shifting to early . I feel first shift good 2nd barley and then get up to 40 mabey 3rd does not work? Maybey i am not feeling 2nd? Quote Link to comment Share on other sites More sharing options...
kirk280zxv8 Posted December 8, 2009 Author Share Posted December 8, 2009 Also i wont change rear end. I have to fig out what to do with trans tomm and ill kep yall posted go saints! Quote Link to comment Share on other sites More sharing options...
Pyro Posted December 9, 2009 Share Posted December 9, 2009 3.90 gear with 26 inch tall tires and 1:1 top gear makes the car go 19.8 mph every 1000 rpms. so 70mph should be at 3,535 rpms in 3rd gear, 140 at 7000 rpms 46 mph will be 3535 rpms in 2nd gear (1.52:1) Quote Link to comment Share on other sites More sharing options...
kirk280zxv8 Posted January 16, 2010 Author Share Posted January 16, 2010 tires are24.5 still sucks i wish i had my six still v8 fun but a headache! Quote Link to comment Share on other sites More sharing options...
Pyro Posted January 17, 2010 Share Posted January 17, 2010 takes time and some tweaking to get a v8 setup right. install a gm t5 from a v8 camaro. Quote Link to comment Share on other sites More sharing options...
Wilson_WWSC Posted January 20, 2010 Share Posted January 20, 2010 is there a good write up for the T-5 conversion? About how much will everything cost to convert a th350 to a t5? The wc t-5's seem to be rare finds. Quote Link to comment Share on other sites More sharing options...
A. G. Olphart Posted January 25, 2010 Share Posted January 25, 2010 I have th-350 tran with no overdrive and no top end i either need 700r4 oe 336 rear end let me know what i should do . i just finished v8 conversion or so i thought please help me with any pointers. The 2004-R is great trans, but needs a little help. Chris at http://www.CKPerformance.com builds upgraded hard parts and shift kits in house, sells parts as well as built and tested trannys. (They are used in a lot of turbo Buicks/ Grand Nationals). > > > Quote Link to comment Share on other sites More sharing options...
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