View Full Version : 4:11 Gears and highway travel???


mattvogt
02-12-2008, 12:04:06 PM
Hello everyone, basically I am thinking through which route i want to go with a transmission. I have 411 gears in my rear end, and right now I have a TH350 and a rebuilt 350 with roughly around 350 horsepower. What can I do OTHER than change the rear end gears to drive on the highway, like everything that I have read says that 4:11's suck on the highway, and you really want like 373 or 342's if the car is going to be going that far.

I wouldnt mind a transmission swap, but I have pretty limited funds as Im a college student. This is a project, not my daily driver, so nothing needs to happen soon. I just want to start and get ideas about my project over the summer.

I would like a manual tranmission I think, like if its in my price range. I would obviously love a T56, like everyone, but I think its fairly out of the question at the moment.

Would a 4 speed do alright on the highway, or are the gears still to large to get up to around 90 mph?

I think Id like a 5 speed, but everything that I have heard says that they are too weak to use. I have seen the TKO's but they are a good amount of money, about as much as a T56. Any options are greatly appreciated.

Thanks for reading this and thanks for the help.

Matt

theflash
02-12-2008, 01:02:22 PM
Most 4 speeds I have seen, still have a 1:1 ratio in 4th, so you're not gaining anything switching. I'd put at least a 28" tall tire on if you don't already have that (275/60-15 is a good example). How much driving do you actually do on the highway? I have 4.10's in my car, and it is singing on the highway, but I don't care since it's not my daily driver.

gordonquixote
02-12-2008, 01:04:34 PM
+1 to waht Flash said.

Unless you have a motor that likes to stay stretched out in the 4-5,000 range, you don't want to drive at highway speeds with 4.11s. 1:1 ratio is correct in 4-speeds in 4th gear.

circle racer
02-12-2008, 01:10:38 PM
82-87 Chevy trucks had an aluminum 4 spd O.D. tranny it needs the bell housing that came with the tranny.

1FstChevy
02-12-2008, 01:16:30 PM
Ideally I'd say go for the 6speed, but your options are going to be limited if thats out of your budget at the moment.

Personally my Z28 loves to cruise with its 4:10 rear end in 6th gear! roughly 2500RPM @ 60 but it'll happily shoot for 6K at higher speeds for a long period of time, however thats with a Richmond 6 speed (strong to 800ft lbs) so its different than the standard T56 most people seem to have.

woody80z28
02-12-2008, 01:25:52 PM
I also have a 6spd with 4.10 gears and a 28" tire and it cruises along the highway great. Going from a 26 to a 28" rear tire dropped the rpms at 60mph from about 1750 to just over 1400.

Twisted_Metal
02-12-2008, 02:06:57 PM
A 200-4R swap isn't cheap but I would go with that option before I converted to a manual with OD gears.


A Gear Vendors OD unit will bolt to your TH350.... Again, not cheap.

muscl car
02-12-2008, 02:15:22 PM
i'm running 4.10's in my camaro and with 28.5 inch tall tires it's about 3k at 60mph and it really doesn't bother me . i'm getting ready to go thru the axle since i hurt it and go up to 4.56 gears and according to some of those online gear/rpm computers rpm's will only go up 332rpm

here's what i tell people with low gears just sit back and enjoy the drive/scenery and eventually you'll get there

mattvogt
02-12-2008, 05:26:46 PM
The tires that I have on my car are 295/50/15's. So there arent really any 5 speeds for other factory GM cars that I can throw in? Like I want to be quick off the line, but I also want to be able to cruise a bit. I dont really think Ill drive that much on the highway, i just want it to be easily done if I want to take it somewhere a little off the beaten path.

Would that 4 speed with overdrive work fine? like obviously I'd need all the linkages and such, but you think its strong enough?

Any ideas on the T-5's stock for the V8 F-bodies in the 80's? thanks for the help guys.

Dstryr
02-12-2008, 05:33:05 PM
The tires that I have on my car are 295/50/15's. So there arent really any 5 speeds for other factory GM cars that I can throw in? Like I want to be quick off the line, but I also want to be able to cruise a bit. I dont really think Ill drive that much on the highway, i just want it to be easily done if I want to take it somewhere a little off the beaten path.

Would that 4 speed with overdrive work fine? like obviously I'd need all the linkages and such, but you think its strong enough?

Any ideas on the T-5's stock for the V8 F-bodies in the 80's? thanks for the help guys.


All 5 speeds from early gm years were junk. You will break it before anything so dont waste money / time putting one in. Especially the 80's T-5's... They broke from the 305's that came with those cars. Your best bet is to find an lt1 t56 at a deal price (like 7-800) and do the swap on a budget. Its going to be your best bet...

angelz28
02-13-2008, 09:41:48 AM
get a t56

protour73
02-13-2008, 06:34:25 PM
I think Id like a 5 speed, but everything that I have heard says that they are too weak to use. I have seen the TKO's but they are a good amount of money, about as much as a T56. Any options are greatly appreciated.

Thanks for reading this and thanks for the help.

Matt

are you going to be over 600 ft./lb's of torque? Tremec TKO600 is good up to that.......
that's not too weak!!;)

andymiller
02-13-2008, 07:37:31 PM
7004r has a taller 1st and 2nd gear so more ass off the line then 1:1 in 3rd and .70 in 4th. I have 3.73's and a 700r4 and cruise at 1800 at 55-60.

A 2800 stall helps me off the start as well

cmonson
02-13-2008, 09:11:12 PM
I have a 4 speed, 3.42 gears, 245-60-R14 tires and I hover right at about 3000 RPM at 65MPH.

It is a great all around combo. Cruises nice, and really pulls nice with my 3.5:1 1st gear.

IMO 3.42 gears are the best choice for an all around street used car...

79Zed28
02-13-2008, 09:14:52 PM
In Arizona, I got a quote for a 700r4. Shop will supply a rebuilt tranny and install it. They will do all this for only 700$. Which i think is a great deal. They convinced me that the 2004r is harder to come by. So as soon as i get the money I am going to swap this, with some 4.10 gears.

cmonson
02-13-2008, 09:52:43 PM
why not do a 4 speed swap.

inthepocket
02-13-2008, 11:16:48 PM
Check out this automatic from FB trannys. You have choices for your 4 th gear set up. You can run up to 0.67 4th gear and still have the gear set of turbo 400 for 1st thru 3rd. i know a couple of guys that have this tranny in their 1st gen camaros with 750+ big inch motors and they drive them every where at anytime. Lots of good things about this tranny. I am little upset I didn't see it before I got my turbo400.


http://www.fbperformance.com/page.asp?get=9&t=TopR_BottomL

night rider
02-14-2008, 01:57:13 PM
The RPM aint that bad with lower gears. A stock engine aint gonna like it but if you have a performance based engine that breaths good in the 4K to 5500 rpm range then it will love it.

Swap your rear tires out to a pair of 275/60-15's (28" tall) and heres what your rpm will look like

50mph 2500rpm
60mph 3000rpm
70mph 3500rpm
80mph 4000rpm
90 mph 4500rpm
100mph 5100rpm
110mph 5600rpm
120mph 6100rpm
130mph 6600rpm

running steady on the highway at 80-90 mph (4000-4500rpm) wouldnt be too bad if the engine breaths good at those rpms and makes power there.

mattvogt
02-14-2008, 06:31:07 PM
are you going to be over 600 ft./lb's of torque? Tremec TKO600 is good up to that.......
that's not too weak!!;)

I understand that, but thats the TKO 5 speed I mentioned and they are about as much as a t56. I was really asking about stock 5 speeds. Thanks for the response though.

I could do a 4 speed, but the final 1:1 would have high RPM's on the highway. I guess I am going to save up a little and either get a 5 speed or a 4 speed overdrive auto... Its not really what I wanted (price wise), but it will work.

Thank all of you for your help. Especially for the RPM-speed chart, that was helpful.

Matt

CC 74 Z/28
02-19-2008, 04:55:35 AM
You have pretty much the same engine ,tranny ,rear end combo as I do.
It's a heck of a lot of fun around town..but not so on a long Hwy Cruise.
Do yourself a favour and get yourself an overdrive tranny, or for the time being maybe change your gear ratio to something higher such as a 3.42 or 3.73

You won't sacrifice much power with the 3.42's. It will get a little better fuel mileage and have much better manners on the Hwy.
I'm able to change to an overdrive this year. But, if I couldn't have done that, a new set of 3.42 gears would have been in order for sure.