bowtie overdrives? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

willow72 · 05-27-2005, 01:46 PM

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

also does anybody know a good tranny shop to get agood 700r4 if bowtie overdrives aint any good? o yea in dallas /ftworth area thanks again for any info, john

smokekiki · 05-27-2005, 02:37 PM

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.

**pjmoreland** · 05-27-2005, 03:46 PM

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.

smokekiki · 05-27-2005, 04:35 PM

I could be remembering wrong,or my not so accurate factory tach,or a little of both.

I am taking it out in a little bit.

**pjmoreland** · 05-27-2005, 05:11 PM

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.

**Smitty** · 05-27-2005, 05:47 PM

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.

willow72 · 05-28-2005, 07:28 AM

ttt

willow72 · 05-28-2005, 07:41 AM

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

**53burb** · 05-28-2005, 07:57 AM

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.

68Stepbed · 05-29-2005, 12:19 AM

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.

He hated it.
I would definetly go with a lower gear. If I go with a 700R4, I'm gonna install 4.11's in mine.

krue · 05-28-2005, 07:53 AM

Using the above equation and substituting 31" tire I get 1631 rpm. Kinda low.

willow72 · 05-29-2005, 08:48 AM

ttt

djracer · 05-30-2005, 10:57 PM

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!

djracer · 05-30-2005, 10:59 PM

I have had later model trucks with 3.08 gears and I was always happier with a 3.42!

vfrdude · 05-31-2005, 11:22 AM

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.

05-27-2005, 01:46 PM	#1
willow72 Registered User Join Date: Nov 2003 Location: dallas/ftwoth Posts: 112	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 also does anybody know a good tranny shop to get agood 700r4 if bowtie overdrives aint any good? o yea in dallas /ftworth area thanks again for any info, john Last edited by willow72; 05-27-2005 at 01:51 PM. Reason: add info

05-27-2005, 02:37 PM	#2
smokekiki Mike Join Date: Jan 2003 Location: west chester pa Posts: 2,473	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. __________________ 70'c/10, 71 suburban4x4 402bb, 72suburban 4/6 drop, 72k/5 4x4 blazer 4" lift 35 tires

05-27-2005, 04:35 PM	#4
smokekiki Mike Join Date: Jan 2003 Location: west chester pa Posts: 2,473	I could be remembering wrong,or my not so accurate factory tach,or a little of both. I am taking it out in a little bit. __________________ 70'c/10, 71 suburban4x4 402bb, 72suburban 4/6 drop, 72k/5 4x4 blazer 4" lift 35 tires

05-27-2005, 05:47 PM	#6
Smitty Senior Member Join Date: Dec 1999 Location: Spring Valley, Ca. Posts: 1,136	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. __________________ Smitty '71 Short Fleetside Spring Valley, Ca.

05-29-2005, 12:19 AM	#10
68Stepbed Registered User Join Date: Mar 2005 Location: 10-Uh-See Posts: 5,609	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. He hated it. I would definetly go with a lower gear. If I go with a 700R4, I'm gonna install 4.11's in mine. __________________ Matt 68 C10 stepside, LS1/700R4, TCI Engineering suspension system

05-27-2005, 03:46 PM	#3
pjmoreland Senior Member Join Date: Jan 2005 Location: CA Posts: 5,982	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.

05-27-2005, 05:11 PM	#5
pjmoreland Senior Member Join Date: Jan 2005 Location: CA Posts: 5,982	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.

05-28-2005, 07:28 AM	#7
willow72 Registered User Join Date: Nov 2003 Location: dallas/ftwoth Posts: 112	ttt

05-28-2005, 07:41 AM	#8
willow72 Registered User Join Date: Nov 2003 Location: dallas/ftwoth Posts: 112	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

05-28-2005, 07:57 AM	#9
53burb Senior Member Join Date: May 2004 Location: Queen Creek, AZ Posts: 1,010	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.

05-28-2005, 07:53 AM	#11
krue Designated A-hole! Join Date: Mar 2003 Location: South Mississippi Posts: 36,448	Using the above equation and substituting 31" tire I get 1631 rpm. Kinda low. __________________ "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"

05-29-2005, 08:48 AM	#12
willow72 Registered User Join Date: Nov 2003 Location: dallas/ftwoth Posts: 112	ttt

05-30-2005, 10:57 PM	#13
djracer Registered User Join Date: Feb 2001 Location: Wetumpka, Al, U.S. Posts: 8,892	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! __________________ 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!

05-30-2005, 10:59 PM	#14
djracer Registered User Join Date: Feb 2001 Location: Wetumpka, Al, U.S. Posts: 8,892	I have had later model trucks with 3.08 gears and I was always happier with a 3.42! __________________ 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!

05-31-2005, 11:22 AM	#15
vfrdude Registered User Join Date: May 2002 Location: Oakley, Ca. USA Posts: 137	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. __________________ 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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