NEW SRT RUMBLE BEE TRUCK (2027)

HemiLonestar said:
We do have a rather lengthy discussion thread about it....a stock 8HP90 or a built 8HP70 fits the bill nicely. 90's live behind 650 lb-ft plus all day.
It actually isn't an electronics problem at all. Only need the trans, an e-shifter (you have to figure out how & where to mount it) and the adapter harness; after that it's just 12v constant, 12v switched, ground, brake switch input, tps, rpm, and reverse light output electrical wise. The TCM is inside the valve body. Proper trans tuning and and a custom driveshaft (doesn't have provision for a slip yoke).
It's an immensely popular swap and has been used in something mundane as a stock 318 2bbl in old Mopar to a built big block restomod Chevelle.
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Thanks for bringing me up to speed!

The stock 8HP90 would be too weak for my application, so a modifed version of it would be needed and that's around 15 grand U.S. without a core, just for the unit itself sitting on the shop floor.

It all depends on what the end goal is, I suppose.

Many gears could keep an engine in a very specific/narrow power band if the engine was built strictly for racing and needed that (like the configurable manuals in Pro Stock).

Our engines make a LOT of torque over a WIDE r.p.m. range.

Then you hit another power threshold where a 2-speed auto is required.

It definitely costs money to do it right.

Plan the work, work the plan as they say.
 
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rottenronnie said:
The stock 8HP90 would be too weak for my application, so a modifed version of it would be needed and that's around 15 grand U.S. without a core, just for the unit itself sitting on the shop floor.
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An 8HP90 was used in the Demon 170.......so you're saying you have north of 1025 hp & 945 lb-ft......?
 
HemiLonestar said:
An 8HP90 was used in the Demon 170.......so you're saying you have north of 1025 hp & 945 lb-ft......?
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No I don't, but the "90" can be built to withstand that power level reliably and the "95" is already there, so they say.

But, neither transmission offers the additional strength I am after.

My 48RE was built for 1500 horsepower which is considerably stronger than the 8HP90 or the "95".

My buddy took out (as in wrecked) the "90" in his Demon and is now after the "95" to replace it. His isn't the first transmission that I know of to be overpowered and crater.
Some Demons came with the "90", some without, I guess...I don't know for sure. And...it doesn't really matter to me.

1000 hp (give or take) seems to be the off-the-shelf 90's absolute power limit without tuning for more line pressure and/or tougher parts.

The 8HP95 IS tougher and withstands the numbers your are referring to.

A heavier and taller vehicle (like a truck) would stress either transmission even more.

But regardless, yes they are both tough.

Transmissions power ratings aren't very accurate. If you look around for information, a stock 48RE is rated for 325 horsepower. So...why aren't they immediately breaking behind an 8.3L.?

Same with the HP90s and 95s. Their ratings are based on theory, computer modeling and materials used instead of battlefield conditions.

A brief torque hit with really sticky tires on a well prepped track quickly exceeds theoretical limits and is part of the reason I like to overbuild.
 
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I'm amazed how much power these modern transmissions tolerate...But they also have very precision powertrain controllers/programming to make it all work.

There was a few out there who spent grotesque amounts of money trying to go faster when these trucks were new. The aftermarket didn't really advance very much as far as hard parts except in diesel world.

Even then, it was a high dollar risk with a few marketing guarantees of "this will do exactly what you need it to do!" Only to follow up with a warranty excuse or a no-longer-supported answer when it didn't work out.
 
Your post is GOLDEN.

I took out my stock 48RE almost immediately after installing the Strikers and the first mild cam. 10K for the heads and cam was only the start of the monetary adventure and the subsequent parts carnage.
You ARE actually re-engineering complete and proven units and it takes some time, research and money to modify them properly. And, as I like to overbuild, that costs even more!
 
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rottenronnie said:
Whenever you get tired of shifting, you MIGHT be able to find an adapter to hook that bad boy up to your 8.3. It should last for several seconds.
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Hahaha yeah not in it's currnet state. However that is what they do. Empty the housing and put the bad boys parts in it. I asked the wife if she would like a 3 spd manual in the X3 cos I need the gearbox. Didn't go down well. lol. I just think my truck needs a lower ratio diff 4.56 or 4.88 I dunno.
 
Gears, Shmears.....W.T.F. Kiwi ? ;)

You should have plenty of torque with that engine combination of yours; particularly at your altitude. And even enough to throw a line out and pull the vehicle beside you. 1700+ p.s.i. per cylinder gets a lot of work done!

Your cam isn't very big and is very close to the latest custom grind I had made for my own 8.3. It is around [email protected] ground on a 115 c/l, if I'm not mistaken. (Early closing Intake); Designed for a really wide and usable power band and avoids the big peak Dyno Queen numbers.

Does the engine have a steady relentless pull like a big electric motor OR does it come alive at a certain r.p.m. (say 3800)?

Try a mini compression test on a couple of cylinders. The first 3 bumps should produce around 175 p.s.i. with your 11:1 c.r. and that cam, even with it installed straight-up (not advanced). If you only take out a couple of plugs, try 5 or 6 bumps to compensate for the starters lower speed.
(Not talking about cylinder-to-cylinder consistency here as with a conventional compression test; just looking for a peak number).

If it IS up around 175 and you still aren't happy, have your Tuner give you a couple more tunes with more initial advance. Say, 2 degrees and 4 degrees.
Sometimes those first tunes are conservative...175-ish ensures a solid base. If the cam is installed late, for example, the mechanical cylinder pressure will be lower and you will see it. Same with a vacuum gauge.

Anyhoo, we are both currently wounded, and even the thought of being able to actually do a short compression test is still a dream for me.

Gears, Shmears...:)

As long as we are having fun.
 
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Kiwi SRT10 said:
Hahaha yeah not in it's currnet state. However that is what they do. Empty the housing and put the bad boys parts in it. I asked the wife if she would like a 3 spd manual in the X3 cos I need the gearbox. Didn't go down well. lol. I just think my truck needs a lower ratio diff 4.56 or 4.88 I dunno.
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Yeah an OLD racer trick in the professional stock racing classes. Put the 904 guts in a 727 housing. The lighter parts and that low(er) 2.77 first-gear set was a great "cheat".
 
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Kiwi SRT10 said:
How is the health getting on buddy.
I am getting lazy. I need to get out there and do stuff. But it is nearly winter so not much inspiration.
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Not bad, thanks.
We are flipped and entering warmer weather here for sure, with the first squadron of mosquitoes spotted yesterday. 27C
Wifey might point out there shouldn't be an "e" in mosquitoes, like the "e" in potatoes, but I have to leave that one alone.
How are you making out?
I know you ditched your cone-collar some time ago.That's great, as it greatly reduces the risk of drowning during a prolonged shower.

Finding things to do and taking it slow.

Still helping a buddy oversee construction of a water treatment facility 150km or so from home, so that is a nice diversion. That operation should be up and running before the snow returns.
It has the interest of some guys in the U.S., so I may be spending some time down there in the months to come.

I want to try some snazzy new long-shocks on the old SRT-10 to help with rolling weight transfer from 30 m.p.h. during w.o.t. Even with Drag Radials it can be quite eventful! Kind of a birthday present of sorts as I bought the truck 21 years ago yesterday, and had a birthday myself.
If only I could do that replacement myself. I have a young son-in-law that may be able to do that for me.
 
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rottenronnie said:
Not bad, thanks.
We are flipped and entering warmer weather here for sure, with the first squadron of mosquitoes spotted yesterday. 27C
Wifey might point out there shouldn't be an "e" in mosquitoes, like the "e" in potatoes, but I have to leave that one alone.
How are you making out?
I know you ditched your cone-collar some time ago.That's great, as it greatly reduces the risk of drowning during a prolonged shower.

Finding things to do and taking it slow.

Still helping a buddy oversee construction of a water treatment facility 150km or so from home, so that is a nice diversion. That operation should be up and running before the snow returns.
It has the interest of some guys in the U.S., so I may be spending some time down there in the months to come.

I want to try.some snazzy new long-shocks on the old SRT-10 to help with rolling weight transfer from 30 m.p.h. during w.o.t. Kind of a birthday present of sorts as I bought the truck 21 years ago yesterday, and had a birthday myself.
If only I could do that replacement myself. I have a young son-in-law that may be able to do that for me.
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Sounds like you are doing well.
I have had last physio visit and have my last stretch execises to do. The rest of the exercises is get out there and do stuff type exercise.
Truck still in garage waiting for lower gas prices.
I am going to be positive and go outside today and go do some work at the railway and maybe a walk this afternoon. The sun has burnt off the light cloud/mist and it is a whole 10C. Another stunning day in paradise. Nothing out there that can kill me except my own stupidity. Life is great.
 
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