over drive
January 6th, 2011, 08:15 PM
#1
over drive
Since I am restoring my 77 cutlass supreme brougham. We are playing with the engine, sounds like we are building a stroker 380 around 425 HP, getting rid of the 2 something rear end and putting in 3.42. Now should I bother to put in an 3 speed tran with over drive or just leave the th350 in it. Is there any mod's to do if we put a 3 with overdrive? Also put in a shift kit and stall converter?
January 6th, 2011, 08:54 PM
#2
Moderator
Join Date: Sep 2006
Location: Medford, Oregon
Posts: 13,727
Well, if you do a lot of freeway driving you may see a benifit. But if I remember right the TH200R has a .67 in overdrive. If that's right, then the final drive ratio with 3.42 gears would be about a 2.12. If you decide to go with an overdrive you may want rear end gears more like the 3.91 to give you a final drive ratio of 2.42 which is still pretty tall. I had a 1976 Cutlass years ago with 2.41 gears and it wasn't bad on the highway. My 2 cents worth. John
January 6th, 2011, 09:10 PM
#3
What kind of RPM would it run at 30 and 60 mile an hour if we went with 3.91, to me seems low ,no? My trucks both have 3.73, to me that is low enough. TH200r hard to come by? any mods to the car if I went with this
January 6th, 2011, 09:44 PM
#6
Registered User
Join Date: Sep 2010
Location: Shorewood, Il.
Posts: 3,057
Unless a 200r4 is heavily modified, it won't last with the torque of an Olds!
A 700, with an adapter, woudn't need that much modification to last.
1st gear, [3:06] woud get you out of the gates better, and the O.D. is still there!
3:06 x 3:42 = 10.53
2:52 x 3:42 = 8.64
Some say the RPM drop from 1st to 2nd is accessive, but with the torque of an Olds, you'll be fine!
Mods include moving the crossmember back, shortening the driveshaft, a switch for the O.D. and lockup, and TV cable linkage - all available aftermarket!
To me, posi is a must! One-leggers'll only burn up a tire at a time - both look and feel better!
A 700, with an adapter, woudn't need that much modification to last.
1st gear, [3:06] woud get you out of the gates better, and the O.D. is still there!
3:06 x 3:42 = 10.53
2:52 x 3:42 = 8.64
Some say the RPM drop from 1st to 2nd is accessive, but with the torque of an Olds, you'll be fine!
Mods include moving the crossmember back, shortening the driveshaft, a switch for the O.D. and lockup, and TV cable linkage - all available aftermarket!
To me, posi is a must! One-leggers'll only burn up a tire at a time - both look and feel better!
January 6th, 2011, 09:57 PM
#7
Unless a 200r4 is heavily modified, it won't last with the torque of an Olds!
A 700, with an adapter, woudn't need that much modification to last.
1st gear, [3:06] woud get you out of the gates better, and the O.D. is still there!
3:06 x 3:42 = 10.53
2:52 x 3:42 = 8.64
Some say the RPM drop from 1st to 2nd is accessive, but with the torque of an Olds, you'll be fine!
Mods include moving the crossmember back, shortening the driveshaft, a switch for the O.D. and lockup, and TV cable linkage - all available aftermarket!
To me, posi is a must! One-leggers'll only burn up a tire at a time - both look and feel better!
A 700, with an adapter, woudn't need that much modification to last.
1st gear, [3:06] woud get you out of the gates better, and the O.D. is still there!
3:06 x 3:42 = 10.53
2:52 x 3:42 = 8.64
Some say the RPM drop from 1st to 2nd is accessive, but with the torque of an Olds, you'll be fine!
Mods include moving the crossmember back, shortening the driveshaft, a switch for the O.D. and lockup, and TV cable linkage - all available aftermarket!
To me, posi is a must! One-leggers'll only burn up a tire at a time - both look and feel better!
January 6th, 2011, 10:16 PM
#8
Registered User
Join Date: Sep 2010
Location: Shorewood, Il.
Posts: 3,057
The numbers are your 1st gear ratio x rear end ratio - the higher the better!
3:06 is the 700 - other is a 200.
I like to do the engine and trans seperatly - PIA together, unless you've a lot of room, and an excellent engine hoist.
Everythings available mailorder - uness you've friends at a trans shop.
3:06 is the 700 - other is a 200.
I like to do the engine and trans seperatly - PIA together, unless you've a lot of room, and an excellent engine hoist.
Everythings available mailorder - uness you've friends at a trans shop.
January 6th, 2011, 10:25 PM
#9
The numbers are your 1st gear ratio x rear end ratio - the higher the better!
3:06 is the 700 - other is a 200.
I like to do the engine and trans seperatly - PIA together, unless you've a lot of room, and an excellent engine hoist.
Everythings available mailorder - uness you've friends at a trans shop.
3:06 is the 700 - other is a 200.
I like to do the engine and trans seperatly - PIA together, unless you've a lot of room, and an excellent engine hoist.
Everythings available mailorder - uness you've friends at a trans shop.
January 7th, 2011, 04:03 AM
#11
I would look at a art carr california performance transmition 200r4
you will have plenty of low gear with 390's way to much if it is not posi . Will have better gear spaceing for it up shifts closer ratio's and a taller od you will have to spend money on both a 700 and a 200 . Other wise look into a gear vendor, expensive but no tv cable to adjust and can be driver shifted if wanted or on board computer comes with . The gear vendor is about 2500 and a 200 or 700 will be about 1900 from what i have seen form cpt or tci.
you will have plenty of low gear with 390's way to much if it is not posi . Will have better gear spaceing for it up shifts closer ratio's and a taller od you will have to spend money on both a 700 and a 200 . Other wise look into a gear vendor, expensive but no tv cable to adjust and can be driver shifted if wanted or on board computer comes with . The gear vendor is about 2500 and a 200 or 700 will be about 1900 from what i have seen form cpt or tci.
January 7th, 2011, 04:19 AM
#12
InfoJunkie
Join Date: Oct 2010
Location: Belleville ON Canada
Posts: 287
January 7th, 2011, 06:23 AM
#13
I would look at a art carr california performance transmition 200r4
you will have plenty of low gear with 390's way to much if it is not posi . Will have better gear spaceing for it up shifts closer ratio's and a taller od you will have to spend money on both a 700 and a 200 . Other wise look into a gear vendor, expensive but no tv cable to adjust and can be driver shifted if wanted or on board computer comes with . The gear vendor is about 2500 and a 200 or 700 will be about 1900 from what i have seen form cpt or tci.
you will have plenty of low gear with 390's way to much if it is not posi . Will have better gear spaceing for it up shifts closer ratio's and a taller od you will have to spend money on both a 700 and a 200 . Other wise look into a gear vendor, expensive but no tv cable to adjust and can be driver shifted if wanted or on board computer comes with . The gear vendor is about 2500 and a 200 or 700 will be about 1900 from what i have seen form cpt or tci.
January 9th, 2011, 06:00 PM
#16
Registered User
Join Date: Nov 2008
Location: Central Fl
Posts: 7,871
Jmo but I have a 200-4R with lockup along with a 3.73. Personally I'd go with a 3.55 or even a 3.42 next time. Remember you can choose to not engage the overdrive until higher rpms and on top of that the lockup won't engage until you're in 4th. That sounds like alot of options to me.
Plus they have more evenly spaced ratios, 2.70, 1.52, 1.00, .67. On another note, 200-4R's are powering 9 second 20psi turbo'd GN's making 600+lbft of torque. If built right they're as bullet proof as anything else.
Plus they have more evenly spaced ratios, 2.70, 1.52, 1.00, .67. On another note, 200-4R's are powering 9 second 20psi turbo'd GN's making 600+lbft of torque. If built right they're as bullet proof as anything else.
January 11th, 2011, 07:11 PM
#19
Got a hold of bowtie overdrive, they are setting me up a price, going to a level 3 200r4, couple of upgrades I can do to it. They figure I will need a 2500 to 2800 stall converter put in as well
Thread
Thread Starter
Forum
Replies
Last Post
