Tire size recommendations.

[handloader90]

355 SBC w/ mild cam
SM465/NP205
D60/14BFF 4.56, Detroit in rear

Can't decide on 33's, 35's, 37's or 39.5's.

Looking to keep RPM's in the right place when I hit the highway.

Help a brother out.

 

[nvrenuf]

Probably 35's, maybe 37's but that would be pushing it imo.

 

[scottsdale86]

35's. Your limiting factor is the sm465.

 

[handloader90]

Thanks for the recommendations.

All of this will be going into an old CJ7.

it will be used for wheeling at the local offroad parks but I will be driving to and from wheeling locations. Not looking for too much of a hard core wheeler but something thats good for trails and some obstacles and still streetable.

 

[sweetk30]

play with this http://www.grimmjeeper.com/gears.html

my buddy http://coloradok5.com/forums/member.php?u=52422 has a k30 with 4.56 and 38 tsl/sx built 400sbc. on highway the 3k+ rpms at 65-70ish were getting him bad . so we swapped in a nv4500 and twin sticked the 205 at the same time. WOW is what he said . he loves it now .

 

[handloader90]

Sweet calculator!

2438 RPM in 4th gear @ 70 MPH on 44" tires.

 

[handloader90]

3064 RPM in 4th gear at 70 MPH on 35" tires.

 

[handloader90]

3250 RPM in 4th gear at 70 MPH on 33" tires.

 

[handloader90]

play with this http://www.grimmjeeper.com/gears.html

my buddy http://coloradok5.com/forums/member.php?u=52422 has a k30 with 4.56 and 38 tsl/sx built 400sbc. on highway the 3k+ rpms at 65-70ish were getting him bad . so we swapped in a nv4500 and twin sticked the 205 at the same time. WOW is what he said . he loves it now .

With the twin stick does he drive around now with front in Hi and rear in neutral?

 

[handloader90]

2899 RPM in 4th gear at 70 MPH on 37" tires.

 

[handloader90]

2715 RPM in 4th gear at 70 MPH on 39.5" tires.

 

[muddermilitia]

I would do 37s Mainly because you can get 37" hummer take offs for a good price and they are pretty good on the street. (sounds like you will do lots of street driving)

 

[handloader90]

I would do 37s Mainly because you can get 37" hummer take offs for a good price and they are pretty good on the street. (sounds like you will do lots of street driving)

I've been contemplating this just for the cost.

I've heard that the MT's wear very well on pavement but the tread doesn't look like it would do too well offroad.

Which leaves me with MTR which looks great tread wise.

Trailworthyfab sells them at 75% tread for a very reasonable price.

Just have to decide which wheels to run them on.

 

[muddermilitia]

I got like 50k miles on my set of MTs. Could have gotten more, but I found a good deal on a set locally & winter was coming soon. If you are on Facebook, look up Feltz Tire. They are in Marshfield WI & have better prices than Trailworthy Fab. Very nice people to work with.

EDIT: here's the facebook link https://www.facebook.com/FeltzAutoTire

 

[sweetk30]

With the twin stick does he drive around now with front in Hi and rear in neutral?

no that's hard on parts and driving .

its for offroad use mainly .

 

[Stein]

I've been contemplating this just for the cost.

I've heard that the MT's wear very well on pavement but the tread doesn't look like it would do too well offroad.

Which leaves me with MTR which looks great tread wise.

Trailworthyfab sells them at 75% tread for a very reasonable price.

Just have to decide which wheels to run them on.

You didn't mention them but the bajas are really nice on-road and crawl well especially when grooved. i just looked and Feltz has 100% tread BFG Baja on ebay for $700/set. That is a good price.

 

[Stomis]

35's. Your limiting factor is the sm465.

I dont see how you consider the sm465 a limiting factor? I had 36s and 3.73s in my sm465 truck and it drove perfect. Stick is a different animal than an automatic. 4.56s will drive just fine with a 37 or 38in tire IMO.