building transmission questions

[hemidup]

Why not? I talked to Trans Go engineering about this and they felt it would work fine and saw no reason not to try it. Thanks

Using the Transgo shift in a 6 speed will cause clutch overlap due to the 6 speed can use 2nd prime for an upshift.

 

[PCT]

So your saying, i have to use a special technique to drive my truck... So dumb. According to the tranny tech the 6rfe has a 3% failure rate, which i dont believe

 

[Hemi450hp]

I doubt you would need to worry much about the transmission with the 4.7. Its the higher hp 5.7 guys that are failing often. I have seen a few stock 5.7's lose their transmissions, but most seem to start having problems once you get upwards of about 340-350rwhp.

 

[charonblk07]

So your saying, i have to use a special technique to drive my truck... So dumb. According to the tranny tech the 6rfe has a 3% failure rate, which i dont believe

It's only for people making more hp or those with full bolt-ons that drive like idiots and do everything that will shorten the life of the trans.


If it hurts when you stick a fork in an electrical outlet, the doctor isn't going to redesign the outlet when you complain about it, he's going to tell you to not stick the fork in the outlet. He can put a plug in the outlet but that won't stop you from removing the plug and sticking the fork in it again, and again, and again.


If you want to keep blowing a trans every time you do the exact same thing, why wouldn't you just change the way you do it, it doesn't actually affect the way you drive at all. It's actually more fun as a driver to manually downshift 2 gears than to just step on the pedal, it's more interactive and something I've been doing for 3 years with an engine I guarantee makes more HP/TQ than yours does and I'm still on the same trans.

 

[PCT]

It's only for people making more hp or those with full bolt-ons that drive like idiots and do everything that will shorten the life of the trans.


If it hurts when you stick a fork in an electrical outlet, the doctor isn't going to redesign the outlet when you complain about it, he's going to tell you to not stick the fork in the outlet. He can put a plug in the outlet but that won't stop you from removing the plug and sticking the fork in it again, and again, and again.


If you want to keep blowing a trans every time you do the exact same thing, why wouldn't you just change the way you do it, it doesn't actually affect the way you drive at all. It's actually more fun as a driver to manually downshift 2 gears than to just step on the pedal, it's more interactive and something I've been doing for 3 years with an engine I guarantee makes more HP/TQ than yours does and I'm still on the same trans.

You example makes sense in theory, but they wouldnt design a transmission to fail when you need to get on it. They fact that you need to change a driving style to protect a design flaw is stupid.

 

[hemidup]

You example makes sense in theory, but they wouldnt design a transmission to fail when you need to get on it. They fact that you need to change a driving style to protect a design flaw is stupid.

The design flaw is that the 45RFE was introduced in 1999 and was meant for the lightweight 4.7 Dakota trucks and Jeeps. Well in 2003 the Hemi Ram came out and Chrysler just so happen to backup that engine up with the 45RFE which is pushing the 45RFE to its limits. Once programmers could raise the speed limiter to over 105 mph, guys could now use 4th gear and drive at 130+mph. That's when the transmission problems started to raise its ugly head cause the transmission was not designed for that type of driving. Now build and add additional power and torque to it and its a pretty lame transmission.

 

[PCT]

The design flaw is that the 45RFE was introduced in 1999 and was meant for the lightweight 4.7 Dakota trucks and Jeeps. Well in 2003 the Hemi Ram came out and Chrysler just so happen to backup that engine up with the 45RFE which is pushing the 45RFE to its limits. Once programmers could raise the speed limiter to over 105 mph, guys could now use 4th gear and drive at 130+mph. That's when the transmission problems started to raise its ugly head cause the transmission was not designed for that type of driving. Now build and add additional power and torque to it and its a pretty lame transmission.

gotcha

 

[matty169]

Mine put up with ALOT of WOT highway downshifts.......going up over 130+ more than I ought to.......trans lasted a summer.
Trans never slipped.....just started making BAD noises....LOL
Like these guys said.....drive like an idiot and it WILL break.......of course I also cracked a piston...Soooooo....Now its a 395 forged motor.

 

[DCFCE]

So maybe a dumb question but if I'm on the interstate cruising along I should down shift 3 times to 3rd gear then floor it to pass traffic.

 

[2013rammer]

I guess we can't convert over to the 8spd either?

 

[charonblk07]

So maybe a dumb question but if I'm on the interstate cruising along I should down shift 3 times to 3rd gear then floor it to pass traffic.

It's the best way to keep the trans alive if you do it a lot. Do you have to with stock power, no, but it definitely help long term.

I guess we can't convert over to the 8spd either?

Not at the moment. I've looked at the wiring diagrams between both trans and the only way it could be done would be a trans/PCM swap with quite a bit of rewiring, a new driveshaft, if it's 4wd then you also have to deal with the different transfer case.


At this time you don't really need to look at the 8-speed because people are finally building the 5/6-speeds to handle big power reliably. Both Jerry and Mike have big hp vehicles reliably running their transmissions now.

 

[BackCountryAK]

Been reading this forum for a few years now and always get confused on the downshifting deal before WOT because of the 5 vs 6 speed transmissions. I have the 5 speed. When you guys say shift into 3rd prior to WOT does that mean the evic should show 4 (3rd gear) or show 3 on the evic (2nd prime)?

 

[charonblk07]

Been reading this forum for a few years now and always get confused on the downshifting deal before WOT because of the 5 vs 6 speed transmissions. I have the 5 speed. When you guys say shift into 3rd prior to WOT does that mean the evic should show 4 (3rd gear) or show 3 on the evic (2nd prime)?

On the 5 speed you will shift in 3rd, which is the 1.00:1 gear; on the 6 speed you would shift to 4th which is the 1.00:1 gear. You are just trying to get out of the OD gears before going WOT. The confusing part is that the 5 speed still has 6 gears, which is where the 2nd gear and 2nd prime gear come in. The 6 speed uses all gears in sequence, the 5 speed skips the 2nd prime on upshift but will use the 2nd prime on downshift if the downshift from 3rd to 2nd would be too big of a rpm jump for the engine.

 

[BackCountryAK]

Okay, if I understand correctly then the evic will show 4, which is 3rd gear (5 speed tranny).

 

[charonblk07]

Okay, if I understand correctly then the evic will show 4, which is 3rd gear (5 speed tranny).

No, on a 5 speed trans you will downshift to 3.


3 will be the number, no more, no less; and the number that shall be displayed is 3; 2 thou shall not display, nor will thou display 4 excepting that thou continuest to 3. 1 is right out. 3, being the 3rd number reached, then pushest though the holy go pedal of speed.

 

[BackCountryAK]

Meant show 4 in the ERS not evic.

 

[BackCountryAK]

No, on a 5 speed trans you will downshift to 3.


3 will be the number, no more, no less; and the number that shall be displayed is 3; 2 thou shall not display, nor will thou display 4 excepting that thou continuest to 3. 1 is right out. 3, being the 3rd number reached, then pushest though the holy go pedal of speed.

Guess that's were I get confused. If I leave the display showing 3 when upshifting from a stop it will limit out at 2 prime. Guess that's why if I was downshifting to show 3 in the ERS it would be in 2 prime not 3rd gear.

 

[charonblk07]

On the upshift it will not go into 2nd prime unless you're in tow/haul or the engine is under load to make the 2-3 shift easier. You have no way of controlling the trans going into 2nd prime, if you select "3" from a stop, it will upshift all the way to 3rd gear, it will not stop at 2nd prime; it is not a gear that you can select.

This is your normal shift schedule:

1st, 2nd, 3rd, 4th, 5th.

In tow/haul, under load this is your shift schedule:

1st, 2nd, *2' (if required), 3rd, 4th, 5th

 

[BackCountryAK]

That's what seems so weird to me. If I leave the ERS in 3, when upshifting there is very little rpm drop between the 2-3 shift and had me thinking it was 2 prime. If I put the ERS in 4 there is a noticeable rpm drop between the 2-3 shift.
My transmission was rebuilt awhile back after the tranny fluid gelled. Arctic temps work wonders on mechanical things haha. At least the dealership did end up adding the thermal bypass though. Could they have possibly changed something else too with the shift sequence?
Thanks for your help. I do appreciate your knowledge and enjoy reading about your truck.