What's new
CK5
Register an account today to become a member! Once signed in, you'll be able to participate on this site by adding your own topics and posts, as well as connect with other members.

Question on gearing with a SM465

84CUCV

84CUCV

3/4 ton status
Joined
Jul 1, 2002
Posts
7,150
Reaction score
2
Location
NJ for now
I can get cheap axles with 4.56 gears in them. I was going to put this in a 86 K5 with 5.0 sm465 and 208. I am going to run 35s. No plans to go bigger. Dont know much about gearing so i was thinking with 35s and 4.56 i would be OK or am i just way off. as always thanks for the help
 
PM Readymix that is the setup he runs and he just recently went from 36s to 39.5. He should be able to tell you how it worked with the smaller tires.

Ira
 
Highway driving won't be much fun, but it will work. I've got 4.10's, 35's and no overdrive in my K5. The engine is really spinning at 70+ mph. 4.56's would mean even more revs... Right now I have 4.10's, 35's and a 700R4 in one of my Suburbans. Overdrive makes it much more tolerable on the highway than my non-OD rig. :cool1:
 
84CUCV said:
I can get cheap axles with 4.56 gears in them. I was going to put this in a 86 K5 with 5.0 sm465 and 208. I am going to run 35s. No plans to go bigger. Dont know much about gearing so i was thinking with 35s and 4.56 i would be OK or am i just way off. as always thanks for the help
Click to expand...
theres a few here running around on 35s and 4.10s with the sm465...Chevy305 is one of them, and he thinks its the ideal setup...
 
I just swaped a 465/205 in my 84 k5 and i have 4.56 with 35s and i think its awsome on the trail but is to low for the highway. I am swapping back to 3.73s this weekend. But it all depends on how you drive your truck. I do a lot of highway time but the best gear calculator i have found is at
WWW.FLORDIA4X4.COM
 
2850 rpm at 65 mph with 4.56's and 35's.

Gearing (4.56) X speed (65 mph) X 336 / tire diameter (35")

Rene
 
Too high for my liking, but only if you drive on the freeway much. 2850 is at a conservative (slow) 65 mph too. 75 mph would be almost 3300 rpm...

Rene
 
BIGBLAZE433 said:
theres a few here running around on 35s and 4.10s with the sm465...Chevy305 is one of them, and he thinks its the ideal setup...
Click to expand...

Ya thats true, I run the 5.0L/SM465 with 4.10s and 35"s. I think its a great all around combo. I think about 2950 is 75mph.

4.56 would be fine, but only if you plan on not going on the highway much or take long trips in it.
 
That's a little higher rpm than what would be considered ideal for highway cruising, but it's not horrible or anything. There were tons of trucks that came from the factory in the 70's, 80's, and even 90's that would spin that type of rpm at 65 mph, and might even have a higher rpm at that speed.
 
SierraClassic said:
I usually like to target my small blocks to about 2200 rpm, thats their sweet spot :)
Click to expand...

x2. Ive always been told that you get the best mileage on the highway with the motor turning between 2000 and 2500. anything over that and it will start to drop. on the other hand if most of your driving is around town rather then long highway trips then the lower gears will help it get better mileage cause it will pull itself around better in the stop and go stuff. personally I think 4.10s would be a better choice if its gonna be a dd.
 
Only was going to go with 4.56 axles because i can get them for 100 bucks. So i was thinking what the heck. 4.10s are sounding like the way to go now thanks guys
 
OK a new turn a friend of mine said he found 4.10 60 and 14b that i could get for a ok price. now my question is with 4.10s could i pull off a 38-40" tire and be ok with it? thanks
 
You must log in or register to reply here.

Latest Posts

Top Bottom