700R4 and 3.73s?
10-25-2005, 09:09 PM
#1
Supreme Member
Thread Starter
iTrader: (1)
Join Date: Oct 2004
Location: Worcester, MA
Posts: 3,361
Likes: 0
Received 1 Like
on
1 Post
Car: 86 T/A
Engine: HSR 355
Transmission: 700R4
Axle/Gears: 2.77 posi
700R4 and 3.73s?
Who uses them? I'm worried about going from 2.73s that it'll hurt my gas milage. On the highway I was over 2K at 75 mph, so 3.73s are really going to up my rpms.
10-25-2005, 09:44 PM
#2
Supreme Member
iTrader: (3)
Join Date: Sep 2005
Location: MD
Posts: 1,685
Likes: 0
Received 3 Likes
on
3 Posts
Car: '88 IROC-Z medium orange metallic
Engine: L98
Transmission: 700R4
Axle/Gears: 3.27
Use the RPM calculator in the tech section on the homepage. I calculated mine with 4.10's and a 26" tire and it was only like 2200 rpms @ 60 MPH.
10-26-2005, 12:23 AM
#3
Supreme Member
Thread Starter
iTrader: (1)
Join Date: Oct 2004
Location: Worcester, MA
Posts: 3,361
Likes: 0
Received 1 Like
on
1 Post
Car: 86 T/A
Engine: HSR 355
Transmission: 700R4
Axle/Gears: 2.77 posi
I don't know my tire size. And at 75mph I'm around 2500 rpm, other people with the same tranny a 3.73 say they drive 75 mph at almost the same RPMs which isn't possible.
10-26-2005, 12:30 AM
#4
Moderator
Join Date: Jan 2000
Location: Mercedes Norte, Heredia, Costa Rica
Posts: 20,981
Likes: 0
Received 9 Likes
on
8 Posts
Car: 1984 Z28 Hardtop
Engine: 383 Carb
Transmission: 4L60
Axle/Gears: 3.54 Dana 44
Your tire will be close enough to 26". In O/D at 60 mph with 3.73s you'll be about 2000 RPM, at 75 mph you'll be about 2500.
10-26-2005, 07:55 AM
#5
Senior Member
Join Date: Oct 2005
Location: Cincinnati, Ohio
Posts: 535
Likes: 0
Received 1 Like
on
1 Post
Car: 1989 Iroc Z
Engine: 496 BBC
Transmission: th400
Axle/Gears: 4.11
Does Changing your gears to 3.73 make your rpm range higher? I thought it just makes the gears shorter but its still in the same RPM range?
10-26-2005, 10:12 AM
#6
Supreme Member
iTrader: (3)
Join Date: Sep 2005
Location: MD
Posts: 1,685
Likes: 0
Received 3 Likes
on
3 Posts
Car: '88 IROC-Z medium orange metallic
Engine: L98
Transmission: 700R4
Axle/Gears: 3.27
No, the RPM range is detimined by the power band of the engine. You use the right converter and gears to keep the engine operating in it's powerband.
Trending Topics
10-26-2005, 12:28 PM
#8
Originally posted by firebirdjosh
I don't know my tire size. And at 75mph I'm around 2500 rpm, other people with the same tranny a 3.73 say they drive 75 mph at almost the same RPMs which isn't possible.
I don't know my tire size. And at 75mph I'm around 2500 rpm, other people with the same tranny a 3.73 say they drive 75 mph at almost the same RPMs which isn't possible.
10-26-2005, 06:29 PM
#9
Supreme Member
iTrader: (3)
Join Date: Sep 2005
Location: MD
Posts: 1,685
Likes: 0
Received 3 Likes
on
3 Posts
Car: '88 IROC-Z medium orange metallic
Engine: L98
Transmission: 700R4
Axle/Gears: 3.27
Originally posted by vic_V8
around town there will be no difference in MPG, only on the interstate.
around town there will be no difference in MPG, only on the interstate.
10-26-2005, 06:33 PM
#10
Supreme Member
Thread Starter
iTrader: (1)
Join Date: Oct 2004
Location: Worcester, MA
Posts: 3,361
Likes: 0
Received 1 Like
on
1 Post
Car: 86 T/A
Engine: HSR 355
Transmission: 700R4
Axle/Gears: 2.77 posi
Originally posted by Dialed_In
What?
What?
My tach must be way off since I had well over 2K at 75 mph.
10-26-2005, 06:57 PM
#11
Senior Member
Join Date: Oct 2005
Location: Cincinnati, Ohio
Posts: 535
Likes: 0
Received 1 Like
on
1 Post
Car: 1989 Iroc Z
Engine: 496 BBC
Transmission: th400
Axle/Gears: 4.11
Originally posted by Dialed_In
No, the RPM range is detimined by the power band of the engine. You use the right converter and gears to keep the engine operating in it's powerband.
No, the RPM range is detimined by the power band of the engine. You use the right converter and gears to keep the engine operating in it's powerband.
10-26-2005, 07:11 PM
#12
Supreme Member
iTrader: (3)
Join Date: Sep 2005
Location: MD
Posts: 1,685
Likes: 0
Received 3 Likes
on
3 Posts
Car: '88 IROC-Z medium orange metallic
Engine: L98
Transmission: 700R4
Axle/Gears: 3.27
No, the powerband is detirmined by the engine and where it makes it's power. The 3.73's keep the engine within it's powerband.
Thread
Thread Starter
Forum
Replies
Last Post
[CA] 700R4 trans & parts
6998poncho
Engine/Drivetrain/Suspension Parts for Sale
0
09-25-2015 02:56 PM
