tranny question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Kris Fuller · 12-08-2004, 03:31 PM

I have a 70 chevy with a saginaw three speed. There is 3-73 gears in the rear. I heard about a 200R4 install. Is this a good idea? I am running 2900RPM at 60 MPH. I want to get the RPM's down. I have a limited budget and any help is appreciated. As soon as I figure it out I will post pics of my 1 month old, old skool truck.
Thank you 70 forever

Kas68c10 · 12-08-2004, 04:11 PM

I think the 200r4 is the cheapest, easiest way to go.But it may not hold up to the hp of your engine. Lotsa guys here will know more than me...could also search the board, you will find lots of threads on this topic.

gmc67swb · 12-08-2004, 06:35 PM

I don't think it's the cheapest route, but definitely one of the best. The 200r4 from a Grand National would the best to get. In stock form it will handle your motor just fine and when built right it will handle alot more than you could throw at it. The cheapest route would be to switch to a taller gear (lower numerically).

Kas68c10 · 12-09-2004, 10:01 AM

Ok, I was thinkin tranny/od swap, the taller gear is definately cheaper

Tx Firefighter · 12-09-2004, 10:03 AM

Taller tires are the cheapest of all. A set of 31 inch tall tires would effectively "kill" the gear some.

Kris Fuller · 12-09-2004, 10:48 AM

I was just in Germany and France for the Army. I was looking for any truck but didnt see anything. Cool truck WOW Italy

67ChevyRedneck · 12-09-2004, 01:46 PM

It's not cheap, but its worth it. My 67 has a 700R4. Runs 23-2400rpm @ 75-80mph with a 3.73 rear and 15mpg. I got a free tranny from my dads old 83 firebird and automatic crossmember from a junkyard, $35, you will also need a tv cable kit from Bowtie Overdrives, $130, a tranny cooling kit, about $50, a converter lock up kit, $75, I had to shorten my driveshaft, $15, and one case of beer, $18. Unfortunately my tranny blew after 6,000 miles. Most likely due to not purchasing Bowtie Overdrives TV cable kit. I am now looking at a local rebuild shop...$900 for tranny, and I WILL be getting the BTO kit.

12-08-2004, 03:31 PM	#1
Kris Fuller Registered User Join Date: Mar 2001 Location: Raeford, NC. Posts: 34	tranny question I have a 70 chevy with a saginaw three speed. There is 3-73 gears in the rear. I heard about a 200R4 install. Is this a good idea? I am running 2900RPM at 60 MPH. I want to get the RPM's down. I have a limited budget and any help is appreciated. As soon as I figure it out I will post pics of my 1 month old, old skool truck. Thank you 70 forever

12-08-2004, 04:11 PM	#2
Kas68c10 Registered User Join Date: Apr 2000 Location: Freeland,Michigan,USA Posts: 312	I think the 200r4 is the cheapest, easiest way to go.But it may not hold up to the hp of your engine. Lotsa guys here will know more than me...could also search the board, you will find lots of threads on this topic. __________________ 1968 SWB Stepside, 250,pwr disc brake and tilt pwr steering, 5 spd tranny, HEI,Accel coil,K&N filter,Seat from a later truck with built in seatbelts, front and rear sway bars, moved gas tank to under the bed, headman hedders, new chrome bumpers,one wire alternator,Weber k550cub carburator...WORK IN PROGRESS, Freeland MI , Just bought a 72 Jimmy!!!!!!!!!!!

12-08-2004, 06:35 PM	#3
gmc67swb Registered User Join Date: Feb 2003 Location: Mesquite, Tx Posts: 396	I don't think it's the cheapest route, but definitely one of the best. The 200r4 from a Grand National would the best to get. In stock form it will handle your motor just fine and when built right it will handle alot more than you could throw at it. The cheapest route would be to switch to a taller gear (lower numerically). __________________ GM 330HP/350, Magnuson 122HH, Tremec TKO 5spd

12-09-2004, 10:01 AM	#4
Kas68c10 Registered User Join Date: Apr 2000 Location: Freeland,Michigan,USA Posts: 312	Ok, I was thinkin tranny/od swap, the taller gear is definately cheaper __________________ 1968 SWB Stepside, 250,pwr disc brake and tilt pwr steering, 5 spd tranny, HEI,Accel coil,K&N filter,Seat from a later truck with built in seatbelts, front and rear sway bars, moved gas tank to under the bed, headman hedders, new chrome bumpers,one wire alternator,Weber k550cub carburator...WORK IN PROGRESS, Freeland MI , Just bought a 72 Jimmy!!!!!!!!!!!

12-09-2004, 10:03 AM	#5
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	Taller tires are the cheapest of all. A set of 31 inch tall tires would effectively "kill" the gear some. __________________ I'm on the Instagram- @Gearhead_Kevin

12-09-2004, 10:48 AM	#6
Kris Fuller Registered User Join Date: Mar 2001 Location: Raeford, NC. Posts: 34	I was just in Germany and France for the Army. I was looking for any truck but didnt see anything. Cool truck WOW Italy

12-09-2004, 01:46 PM	#7
67ChevyRedneck Hittin E-Z Street on Mud Tires Join Date: Nov 2004 Location: Greenville, SC Posts: 23,090	It's not cheap, but its worth it. My 67 has a 700R4. Runs 23-2400rpm @ 75-80mph with a 3.73 rear and 15mpg. I got a free tranny from my dads old 83 firebird and automatic crossmember from a junkyard, $35, you will also need a tv cable kit from Bowtie Overdrives, $130, a tranny cooling kit, about $50, a converter lock up kit, $75, I had to shorten my driveshaft, $15, and one case of beer, $18. Unfortunately my tranny blew after 6,000 miles. Most likely due to not purchasing Bowtie Overdrives TV cable kit. I am now looking at a local rebuild shop...$900 for tranny, and I WILL be getting the BTO kit.



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