how much Hp needed for 42's?

[panamacj5]

i currently have a CJ5 and iam on the process of swapping a dana60/14 bolt combo it has 4.11 gears and a 302 mildly modified for low end torque...will the 302 have enough hp for 42's

 

[Old Dog]

Don't know about HP but some 5:13 or so gears will help.

 

[jasonmark1993]

it should be ok.

Wont be great but it'll work for awhile.

Like the last guy said, you're gonna want lower gears.

 

[panamacj5]

i am not sure if it has 4.11 or 4.56 i will find out on the 15th...do you guys think 4.56 will be fine or should i go for 5.13s?

 

[derf]

How are you planning on using the CJ? What Transmission is behind the 302? Does it have Overdrive ? All of these things impact what axle gears you want to use.

 

[panamacj5]

the cj will be use on muddy trails and steep hills
i have a t19 and a Dana 300

 

[derf]

Will you be driving on a highway very often? What's the top speed you plan on driving?

4.56 gears may be good for you since mud and dirt trails need higher wheel speed. The T-19 gives you a great low first gear to compensate when you want to go slower. Though 4.88 or 5.13 may give you a better balance depending on exactly how you plan on driving the Jeep.

 

[panamacj5]

only to get to the trails ...

 

[derf]

Ok, then then 4.56 may not be right. They are more highway friendly. 4.88 or 5.13 gears would be a good choice.

 

[CJim7]

I wouldn't go anything less than 5:13's. It takes a lot to turn 42's and the power output you are suggesting from your engine will cause a lot of clutch-riding...which will lead to clutch failure. you need torque from gear reduction or a lot of power to reduce the wear on components.

With the T19, you will have a very good low ratio....this will help a lot and the Dana 300 can be further geared down with a 4:1 conversion. given that setup, I would hesitate to run anything numerically lower then 4:88's...that will still be pushing it.

Consider STRONGLY upgrading the Dana 300 output.....it is a weak area with large tires and a lot of power/torque.

 

[tarry99]

I wouldn't go anything less than 5:13's. It takes a lot to turn 42's and the power output you are suggesting from your engine will cause a lot of clutch-riding...which will lead to clutch failure. you need torque from gear reduction or a lot of power to reduce the wear on components.

With the T19, you will have a very good low ratio....this will help a lot and the Dana 300 can be further geared down with a 4:1 conversion. given that setup, I would hesitate to run anything numerically lower then 4:88's...that will still be pushing it.

Consider STRONGLY upgrading the Dana 300 output.....it is a weak area with large tires and a lot of power/torque.

Not all Ford T-19's had the 6:32 low gear in fact they are quite rare. Most of the T-19s had I believe a 5.00 low gear.

 

[tarry99]

Not all Ford T-19's had the 6:32 low gear in fact they are quite rare. Most of the T-19s had I believe a 5.00 low gear.

Correction:

Most Borg Warner T-19's had a 4.02 low gear.
Almost as rare is the 5.11 low and then the extremely rare 6.32. I guess the best part of this Transmission is there are syncro's in all 4 forward speeds.
Gears are available but requires changing several gear sets$$$$.

 

[Incommando]

I don't know about extremely rare but to assume that all T19's are the 6.32 may lead you to a surprise after you buy it.

As other's have said: gearing is more important than horsepower. Toyota boys routinely run 37-38" tires with a 4-popper that is lucky to put 50 horsepower to the ground. You may not be happy with 42" tires and 4.10 gears even if it is the wide-ratio 6.32 tranny. 6.32 is really deep for normal on-road driving and the drop from 1st to 2nd, the gear ratio that most people with a wide-ratio T-18 /19 use to start out on the road, is a pretty big one.

A member here, Derf (?), has an outstanding website at www.grimjeeper.com. Go there and enter your options until you get both a crawl ratio and a 55-65 MPH RPM level that you can realistically live with. 4.56's may give you the balance you are looking for if you have the 6.32 1st gear.

 

[NorthwestCJer]

You can call Novak if you question this.
The only T19 with 6-1 ratio first was used in IH, usually the Scout but it has been known to turn up in the truck also.
T19 with the 5-1 ratio is pretty common in the Ford Bronco and F150 behind the 302 and I6 in the mid 80's.
The T19 in the 4-1 ratio pretty much fell in everything else.
I have been down this road many times and like the T19, I have put them in a few CJ's with the 5-1 ratio.

A T19 (5-1) with the Dana 300 (4-1) and 4.10 gears running 42 inch rubber will have a crawl speed to the ground of 98 feet per min at 750 rpm.83.80 crawl ratio.
Low crawl is more than low enough!

However for highway ; 60 mph in 4th gear you will running 1968 rpm. Its doable but will probably suck on the hills.
4.56's would be 2189 rpm
4.88's would be 2342 rpm.

Keep in mind thow, that those 42's are going to have some attitude on the highway and you may find you don't really want to go 60+ with her.

 

[tarry99]

I don't know about extremely rare but to assume that all T19's are the 6.32 may lead you to a surprise after you buy it.

RARE? Call it what you want, but I looked around on a casual basis for several years at truck wrecking yards all over and never found one, of course most of the wreckers had no Idea how to check except for year , version & motor. If you go on the Ford web site the 6.32 version was only available for 3 years and only with the 460 motor and only in 4 wheel drive. Does that make it Rare or hard to find?
And Yes , IH had version of the Borg Warner T-19 but the case they used unlike the Ford version would be hard to swap into a bell housing because of the lack of ears.

I went with the BW T-18 Ford version , much easier to find and get parts.

 

[Incommando]

You can call Novak if you question this.
The only T19 with 6-1 ratio first was used in IH, usually the Scout but it has been known to turn up in the truck also.
T19 with the 5-1 ratio is pretty common in the Ford Bronco and F150 behind the 302 and I6 in the mid 80's.
The T19 in the 4-1 ratio pretty much fell in everything else.
I have been down this road many times and like the T19, I have put them in a few CJ's with the 5-1 ratio.

A T19 (5-1) with the Dana 300 (4-1) and 4.10 gears running 42 inch rubber will have a crawl speed to the ground of 98 feet per min at 750 rpm.83.80 crawl ratio.
Low crawl is more than low enough!

However for highway ; 60 mph in 4th gear you will running 1968 rpm. Its doable but will probably suck on the hills.
4.56's would be 2189 rpm
4.88's would be 2342 rpm.

Keep in mind thow, that those 42's are going to have some attitude on the highway and you may find you don't really want to go 60+ with her.

I don't know about extremely rare but to assume that all T19's are the 6.32 may lead you to a surprise after you buy it.

RARE? Call it what you want, but I looked around on a casual basis for several years at truck wrecking yards all over and never found one, of course most of the wreckers had no Idea how to check except for year , version & motor. If you go on the Ford web site the 6.32 version was only available for 3 years and only with the 460 motor and only in 4 wheel drive. Does that make it Rare or hard to find?
And Yes , IH had version of the Borg Warner T-19 but the case they used unlike the Ford version would be hard to swap into a bell housing because of the lack of ears.

I went with the BW T-18 Ford version , much easier to find and get parts.

I said " I don't know about..." I never told anyone they were wrong????

BTW: if the OP stated he did a 4:1 conversion on the Dana 300 I missed it. If we are suggesting other mods why not a Stak 4 spd or an Atlas or an...? A 5:1 T19 with factory Dana 300 with 4.10's and 42's would give you a 54.68 crawl ratio in place of that 83.80. 54.68 is still decent. If you question that an unmodified Dana 300 did not have a 4:1 low gear feel free to call Novak...:laugh:

 

[panamacj5]

i guess i will stay with 4.56 to save some money ...we dont do rock crawling here in panama or at least most people dont ... i will put a link so you can have an idea of our trails, thanks everybody for posting
Nueva Sevilla 2011 Club 4x4 Panamá - YouTube

 

[tarry99]

i guess i will stay with 4.56 to save some money ...we dont do rock crawling here in panama or at least most people dont ... i will put a link so you can have an idea of our trails, thanks everybody for posting


Panama,
We all would like to hear whether or not your T-19 has the 6:32 gears out not?
I for one don't see or hear of them often with that low gearing.

I would try out what you have and if you need to change gears in the future there are a lot of options..........

 

[NorthwestCJer]

The 4-1 kit in the Dana 300 was meantioned as an option within a thread. Nobody said it was stock. The original post actually doesn't give us true info. The Dana 300 in stock form would be OK in crawl but his ratio with 4.10's and 44's will still be questionable at 60mph on the highway.

 

[panamacj5]

Dana 300 is stock and i need to find out the gears on the t19