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#1 |
Registered User
Join Date: Nov 2003
Location: dallas/ftwoth
Posts: 112
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bowtie overdrives?
anybody running one of there 700r4 in one of our trucks? how well do they work with 307 rear gears?any better gas mileage and whats the rpms at 70 thanks for any answers
![]() Last edited by willow72; 05-27-2005 at 01:51 PM. Reason: add info |
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#2 |
Mike
Join Date: Jan 2003
Location: west chester pa
Posts: 2,474
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Tx Firefighter lives in Your area,He said he uses Pheonix transmissions.I have a bowtie in my suburban,and with 3.73's i am turning 2200 rpm at 60.
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70'c/10, 71 suburban4x4 402bb, 72suburban 4/6 drop, 72k/5 4x4 blazer 4" lift 35 tires |
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#3 |
Senior Member
![]() ![]() Join Date: Jan 2005
Location: CA
Posts: 5,539
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If you have 29" tires, then here's what the RPM will be at 70 MPH:
(70 mi/hr) x (1hr/60min) x (5280ft/1mi) x (12in/1ft) x (1/(29in x 3.14)) x 3.07 x .7 = 1744 RPM That's pretty low. The vacuum switch that controls the torque converter clutch will probably disengage the clutch on the slightest hill since the engine will start to bog down. I have a 700R4 in my truck with 3.73 gears, and my engine spins at slightly under 2000 RPM at 65. I'm confused by smokekiki's RPM at 60. Seems a little high for an overdrive transmission. It's about right for a non-overdrive transmission without a torque converter clutch. Either that or his tires are really small. |
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#4 |
Mike
Join Date: Jan 2003
Location: west chester pa
Posts: 2,474
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I could be remembering wrong,or my not so accurate factory tach,or a little of both.
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70'c/10, 71 suburban4x4 402bb, 72suburban 4/6 drop, 72k/5 4x4 blazer 4" lift 35 tires |
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#5 |
Senior Member
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Location: CA
Posts: 5,539
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Looks like you have quite the collection of trucks, smokekiki! I'd be impressed if you could keep track of the RPMs on all of those.
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#6 |
Senior Member
![]() Join Date: Dec 1999
Location: Spring Valley, Ca.
Posts: 1,112
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I have a Bow Tie Over Drive in my '71, with a 60 over 350, 3:54 gears (should have stayed with the 3:73's) 275/60 15's it turns around 2400 at around 70-75. Can't drive 65! You can't beat their TV Made EZ kit for setting up the cable. I've got somewhere around 50,000 on it and you can be sure that not a lot of them are easy miles. But mostly freeway! It seems my milage was better with the 3:73's. I do get around 11-12 the way it is now because my foot is usually stuck in the carburator.
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Smitty '71 Short Fleetside Spring Valley, Ca. |
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#7 |
Registered User
Join Date: Nov 2003
Location: dallas/ftwoth
Posts: 112
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ttt
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#8 |
Registered User
Join Date: Nov 2003
Location: dallas/ftwoth
Posts: 112
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i really want to know about what my rpms will be with a 700r4,307 rears, 31 inch tall tires at 70mph and do yall think that will work allright with the 307 rears i think a tranny shop would say yes that will work fine just too sell me one i really need yall help with this decision thank for any help you can give me, john
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#9 |
Designated A-hole!
Join Date: Mar 2003
Location: South Mississippi
Posts: 36,450
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Using the above equation and substituting 31" tire I get 1631 rpm. Kinda low.
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"If it ain't broke, fix it 'til it is!" Being stupid ain't illegal. ![]() We're Still Debt Free Except for the House!!! www.daveramsey.com 70 GMC SWB Stepside project "Green Booger" soon to be 6.0l/4l80e 93 S-10 "Poppaw's Truck" |
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#10 |
Senior Member
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Location: Queen Creek, AZ
Posts: 1,005
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I am planning on doing this swap shortly. I have a 3.07 that I need to install. The 700 has a lower first and second gear than the 350 or 400. I hope that will make up for the high gearing as far as the take off goes from a dead stop. I figure I will only use O/D once I am up to speed on the freeway. I don't think I will need or want it around town. The tires I was planning on using are about 26 inches in diameter. Here is an RPMcalculator. Your RPMs will be only about 1636 @ 70MPH. Kinda low, that is why I would only use O/D once I got over 60MPH on the freeway.
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#11 |
Registered User
Join Date: Mar 2005
Location: 10-Uh-See
Posts: 5,609
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I knew a guy that ran a transmission shop. He had a 71 with a 700R4 and 3.07 gears and 275/60/15 tires and said his ran around 1400 at 70.
![]() I would definetly go with a lower gear. If I go with a 700R4, I'm gonna install 4.11's in mine. ![]()
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#12 |
Registered User
Join Date: Nov 2003
Location: dallas/ftwoth
Posts: 112
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ttt
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#13 |
Registered User
Join Date: Feb 2001
Location: Wetumpka, Al, U.S.
Posts: 8,891
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check with Bob he is the freakin MAN when it comes to a 700r4! http://www.darkhorsetransmissions.com/ Tell him Kevin Tolliver sent you he is a personal friend of mine and he has built atleast a dozen 700's for me!
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Kevin Special Thanks to All who have helped on the TRUCK! My Pass Time Show http://s129.photobucket.com/albums/p...Chapter1-0.mp4 So Far my best Times are: Motor only: 6.44 1/8 @ 104.13 10.39 1/4 @ 125.83 Nitrous Times: 5.785 1/8 @ 118.65 with a 1.336 60ft 9.168 1/4 @ 142.58 with a 250 shot dead out of the hole! |
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#14 |
Registered User
Join Date: Feb 2001
Location: Wetumpka, Al, U.S.
Posts: 8,891
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I have had later model trucks with 3.08 gears and I was always happier with a 3.42!
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Kevin Special Thanks to All who have helped on the TRUCK! My Pass Time Show http://s129.photobucket.com/albums/p...Chapter1-0.mp4 So Far my best Times are: Motor only: 6.44 1/8 @ 104.13 10.39 1/4 @ 125.83 Nitrous Times: 5.785 1/8 @ 118.65 with a 1.336 60ft 9.168 1/4 @ 142.58 with a 250 shot dead out of the hole! |
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#15 |
Registered User
Join Date: May 2002
Location: Oakley, Ca. USA
Posts: 137
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I just went thru this - Installed 700R4 and had 3.07 gearing. RPM's way to low for hiway and I have smaller diameter tires than you do. I had 3.73 gears installed, and it seems to be the perfect gearing for all around driving.
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Rudy Fierros '95 Honda VFR750F Used to have a '71 Chevy Stepside, Guards Red, Lowered 4" rear, 3" front, White Oak bed wood, 700R4 w/373 gears until some low life stole it! |
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