Cruisers & Co + Wholesale Automatics + HGM A750F Transmission Swap

[Dragos80]

For simplicity's sake: 35s + 4.88s.

In 4th gear OD on an OEM setup you are at 3.09 ratio on 31" tires.

In 5th gear you would need 4.33 gears on 31" tires because the 5th gear is taller on the A750 than A343.

 

[Dragos80]

@Cruisers and Co you doing anything to beef up the trans internals?

I don’t believe a 442, 343 or yes even the 750 is up to the task of 300-500whp. The Aussies for a long time have said don’t push these trans over 250 without upgrades or you will regret it. All our bigger HP builds run manual trans or we limit power in an auto for this very reason. More to the point I believe it is big torque that kills the trans when not built for it.

We can see double, even more torque than that out of the diesels vs say the 2uz.

Cheers

New valve body.

 

[SNLC]

New valve body.

First of all that isn’t the issue and second we have had to remove these because they shift so hard, most people don’t want a shift kit that slams into each gear aggressively.

Cheers

 

[Dragos80]

This is what I meant when I said:

In order to visualize the new transmission think about wearing a pair of longer pants.
If you want to have your belt line around the hips, you need to pull the pants down a bit therefore you'd be stepping on them when you walk.
If you want to have your pants clear the ground, you need to pull them up above your bellybutton.

Simply put the 1st and 5th gear will never fall into OEM specs in terms of RPM for the engine. One will have to be sacrificed.
I prefer to sacrifice the 5th gear ratio here and have it lower on the highway with the benefit of getting a much better crawl ratio in 1st gear.

 

[efjayatee]

C&C already shown the way......stick to the path, lol.....its the way!

 

[Dragos80]

First of all that isn’t the issue and second we have had to remove these because they shift so hard, most people don’t want a shift kit that slams into each gear aggressively.

Cheers

I believe post #2 in this thread addresses that issue.

 

[Dragos80]

I am simply guesstimating you'd be around 300-350 RPM lower running 35's and A750.
So at 65MPH somewhere just under 2000 RPM.

Drive faster if you want more RPMs

 

[Cruisers and Co]

First of all that isn’t the issue and second we have had to remove these because they shift so hard, most people don’t want a shift kit that slams into each gear aggressively.

Cheers

Valve bodies are 100% a part of the issue. Rod goes over it in the video in post #2. 4th and 5th have an inherent issue. The diesel trucks also do not have an option for mid shift torque reduction like we do to keep it alive during the shift which is where most of the burning of clutches comes from

 

[COS80]

Simply put the 1st and 5th gear will never fall into OEM specs in terms of RPM for the engine.

This is clear. My question more about how to optimize the entire system with those two new gear ratios, and I believe I have my answer.

 

[Cruisers and Co]

@Cruisers and Co you doing anything to beef up the trans internals?

I don’t believe a 442, 343 or yes even the 750 is up to the task of 300-500whp. The Aussies for a long time have said don’t push these trans over 250 without upgrades or you will regret it. All our bigger HP builds run manual trans or we limit power in an auto for this very reason. More to the point I believe it is big torque that kills the trans when not built for it.

We can see double, even more torque than that out of the diesels vs say the 2uz.

Cheers

besides the VB and better Compushift control we are leaving the trans for the end user to find. An Extreme WAT Rebuild that has been beefed up can be purchased through us if one wants. There is a long lead time to get them here from AUS though

 

[Dragos80]

A 10% transfer case underdrive might solve the low RPM issue in 5th gear which will also improve 1st gear crawl ratio.

 

[Dragos80]

I believe you would be around 3.01:1 ratio vs OEM at 3.09:1 (with an underdrive t-case).

 

[Dragos80]

I made a mistake above. It should be 2.87:1 final with 35" tires instead of OEM 3.09:1 on 31" tires. With an underdrive that is.

 

[Cruisers and Co]

So for reference my current setup with a343 is as follows and I cruise at 75 whenever I’m on the highway. I like the low rpms in when in overdrive. I think 4.88s and 37’s will be the ticket which is where a ton of people are already. The 4:10 w/ 35 crowd could go to 10% UD gears with less hassle than regearing

 

[SNLC]

besides the VB and better Compushift control we are leaving the trans for the end user to find. An Extreme WAT Rebuild that has been beefed up can be purchased through us if one wants. There is a long lead time to get them here from AUS though

Ok so not a complete kit, unless somebody wants that. I have spoke to Rod a number of times about the 750 swap for a 1HDFTE powered Cruiser so pretty familiar.

Cheers

 

[Cruisers and Co]

Ok so not a complete kit, unless somebody wants that. I have spoke to Rod a number of times about the 750 swap for a 1HDFTE powered Cruiser so pretty familiar.

Cheers

People will have the option to make it a complete kit but there are lots of good used low mileage trans out there so we aren’t forcing buying a transmission through us

 

[efjayatee]

So for reference my current setup with a343 is as follows and I cruise at 75 whenever I’m on the highway. I like the low rpms in when in overdrive. I think 4.88s and 37’s will be the ticket which is where a ton of people are already. The 4:10 w/ 35 crowd could go to 10% UD gears with less hassle than regearing

View attachment 4078648

now I gotta do 37s.....F@$ me!!!

 

[SNLC]

Valve bodies are 100% a part of the issue. Rod goes over it in the video in post #2. 4th and 5th have an inherent issue. The diesel trucks also do not have an option for mid shift torque reduction like we do to keep it alive during the shift which is where most of the burning of clutches comes from

So there you go, since Aussies have supplied me with the info they didn’t mention the mid shift torque reduction differences but did mention burning the clutches inside the trans.

Most our customers like manual, me too, I do get that a lot of people don’t want that conversion in their 80. I would love to see what your turbo kits are like behind the manual 5spd though.

Cheers

 

[Cruisers and Co]

So there you go, since Aussies have supplied me with the info they didn’t mention the mid shift torque reduction differences but did mention burning the clutches inside the trans.

Most our customers like manual, me too, I do get that a lot of people don’t want that conversion in their 80. I would love to see what your turbo kits are like behind the manual 5spd though.

Cheers

That’s because the engine Toyota ecu’s (if they have one, obviously FT and DT don’t) can’t interpret the information from the compushift to do that. Ecu Masters, Haltech, Link, motec etc all have that capability.

I have one at the shop if you want to drive one, Denver is a short flight!

 

[Cruisers and Co]

For clarification the mid shift torque reduction is ONLY going to work on trucks with aftermarket ECU’s

It DOES NOT apply to any 80 Series with a factory ecu.