The Stovebolt Page Forums Home | FAQ | Forum | Swap Meet | Gallery | Tech Tips | Events | Features | Search | Hoo-Ya Shop
Helping out ...


EVENTS

Check in for status!

Jump over to the Events Forum, to post events -- new ones or the ones we have been enjoying for some time.
Look to see what's been cancelled or postponed.

Encourage one another!

Stovebolt Site Search
 
Old Truck Calendars
Months of truck photos!
Nothing like an old truck calendar

Stovebolt Calendars

Check for details!


Who's Online Now
8 members (Eureka Jim, Eisenhart1992, HandyAndy, Ed Blouch, bwilliams, 66flea), 129 guests, and 3 robots.
Key: Admin, Global Mod, Mod
Forum Statistics
Forums50
Topics118,977
Posts952,351
Members43,300
Most Online1,229
Jan 21st, 2020
Image Posting Policy
Previous Thread
Next Thread
Print Thread
what do lower gear numbers do for low end???
#1169590 Wed Jun 15 2016 07:06 PM
Joined: Dec 2006
Posts: 376
M
Shop Shark
HI Stovebolters

I am currently debating on switching my current 1985 K5 Chevy Blazer rear end with 4.10 gears with a more modern Chevy Colorado rear end with 3.42 gears in it.

With the 4.10's hooked behind the current stock 4 speed (sm420 ?? I think) my first gear is a granny gear....second gear is like a normal 1 st gear and 3rd and 4th gears are like the normal 2nd and 3rd gear is in today vehicles. I know from a high end aspect the the lower the number in the rear end will result in a higher top end with lower rpm's in the end.

So will the 3.42's make the 1st and 2nd gear's a little more user friendly??? or will it make harder to use???

Any insight would be a wonderful thing.

MikeC


1948 Chevy 1-Ton (sold Nov 2017)
1953 Chevy 1-Ton (sold 10/1/2016)
Howard Knapp
In the Stovebolt Gallery
More pix on Photobucket
Re: what do lower gear numbers do for low end???
mikec4193 #1169601 Wed Jun 15 2016 09:07 PM
Joined: Jun 2009
Posts: 1,885
4
Shop Shark
The taller gears (3.42 is "taller" than 4.10) will make it slower off the line. It might make it a little more user friendly, but I wouldn't think it would be a considerable difference. Why not just get 3.42's for your current rear end? If you change to the Colorado your brakes are different again, you have to worry about mounting and all that... Seems like not the best way to make the change.

Is there a reason you want to use the Colorado? The width of the rear end is also narrower than the K5.

I know that you've been having frustrations with your truck, I don't think this is the right way for you to get taller gears.


1946 GMC Pickup - S-10 Frame, 455 Buick, TH400, original patina.

My 46 GMC on Photobucket
Re: what do lower gear numbers do for low end???
mikec4193 #1169603 Wed Jun 15 2016 09:08 PM
Joined: Jun 2004
Posts: 8,185
W
Master Gabster
It will make a much better driver out of it. All gears will be higher ratio but you have the granny 1st gear for rock crawling.
If it is 4 wheel drive you will have to replace both axles.
The manual 4 speed in that will be a SM 465.

Last edited by Wrenchbender Ret.; Wed Jun 15 2016 09:10 PM.

They say money can't buy happiness. It can buy old Chevy trucks though. Same thing.

1956 Chevy 1/2-Ton Pickup

Re: what do lower gear numbers do for low end???
mikec4193 #1169623 Wed Jun 15 2016 11:40 PM
Joined: Dec 2015
Posts: 2,077
Big Bolt Forum Moderator
I had 3.42 gears in my 59 Suburban with a 350/SM465 and 31x10.10-15 tires. It was very driveable. I only used granny as a granny and could go down the road 90mph+ if I decided to. You will still only user granny every now and then.


Mike

1955 Chevy 6400 ex-flatbed (no bed now!)
In the Stovebolt Gallery


1958 Chevy 6400 flatbed W/dump
In the Stovebolt Gallery

1959 Chevy Suburban Owned for almost 20 years, Daily Driver -- sold May 2016
In the Stovebolt Gallery

Sufficient unto the day is the evil thereof

Moderated by  KCMongo 

Link Copied to Clipboard
Home | FAQ | Forum | Swap Meet | Gallery | Tech Tips | Events | Features | Search | Hoo-Ya Shop
Powered by UBB.threads™ PHP Forum Software 7.7.4