03' Big Red

I would really like to keep this truck since I know what I have and to find a RD with a automatic set up like I need is fairly difficult. i did find a 2003 RD on the internet with a Allison VIN # 1M2P296C23M066900 this should help me create a parts list if I can’t find a suitable donor truck, my guess sticking with a RD would be my best bet for a donor truck.

Thanks for the info, I did find a RD single axle that would work much better.

I talked to my local Mack dealer, they contacted Mack engineering who wouldn’t release any info. i did find several 2001 LE donor chassis with the 4500 series trans, would the mounts and such from the LE work in my RD ? i would appreciate any information in regard to what I may have to change in my ECM, and if any changes are needed can a competent shop make those changes? Or would I have to find a dealership that would make things happen?

I want to swap in a Allison 750DRD in my 2003 RD688S i run the Eaton 8LL now... no computer on trans my question is how will my ECM be effected ? amd what year donor chassis would work to get all the pieces needed? i am looking at a MR for the donor chassis

So I am relatively new to this stuff, am I correct in saying that to go from a 370 to 460 its just a turbo and injector change and no ECM work ? Not that I want to change anything in my ECM, just curious. I’ve heard about a 460 XT that’s about 485 HP is that also injector and turbo or does it include ECM ? Sent from my iPhone using Tapatalk

Any idea what kind of horsepower you have now ? Sent from my iPhone using Tapatalk

That would be awesome! Sent from my iPhone using Tapatalk

He did although I wasn’t sure if the turbo was for a earlier style no AI manifold Sent from my iPhone using Tapatalk

Wow that’s a surprise, so if one is going for torque versus Horsepower then sticking with a AI 350 would give you more than the AI 460 Sent from my iPhone using Tapatalk

I not concerned with cost since I plan to replace the trans and all my work is by the hour, it’s purely for driver enjoyment ! Sent from my iPhone using Tapatalk

Would this be the Turbo needed for a E7 exhaust manifold? I want to go that route since the ports are much bigger and allowed better breathing. I think it’s a Q400 series versus the Q300 used on the AI,AMI Sent from my iPhone using Tapatalk

The AMI 370 is rated at 1480 Ft lb tq at 1300 rpm but it will pull down to 1200 405 hp from 1700-1900 370 hp at 2150 Not at all like the AI series ! sadly I hear this file is no longer available from Mack Sent from my iPhone using Tapatalk

I’ll be swapping out the trans as part of my maintenance program... fix it before it breaks... the 8 LL Has over 500,000 miles I’ll step up to a 9 LL with higher tq rating Sent from my iPhone using Tapatalk

I run the Eaton 8LL I would never go with the 460 since My power band is 1200-2150 Sent from my iPhone using Tapatalk

4.42 and 24.5 Sent from my iPhone using Tapatalk

Yeah I know I am at my limits now with the trans. It’s rated at 1490 and the AMI 370 is 1480 ft lb of torque But hey it sure is much nicer to drive than the AI Much like a old school Maxidyne Sent from my iPhone using Tapatalk

The ECM has been updated to the AMI 370 it was a AMI 350 that ran horrible. Sent from my iPhone using Tapatalk

I have a 2003 RD688s with a AMI 370, the VIN is 067246 I would like to bump up the horsepower by about 100 What do I need to do for this increase? I’ve read other post on this site about offset camshaft key ways and swapping in a older E7 exhaust manifold,turbo and 5” exhaust to allow the engine to breathe better. I prefer staying with factory style injectors if possible since I’ve had aftermarket injectors in the past and found them to be unreliable. So with the above information what would turbo and injectors would be needed for a 100 HP increase? Sent from my iPhone using Tapatalk

I am considering putting the TRXL1071A in my 2003 RD688s, I have a Eaton RTOF 8 LL now. i have the AMI 370 so I don’t think I’ll have a issue with the extended range nature. i like the 23.08 low gear,5 speed and the multi speed reverse features of this trans. the direct 5 th will work fine with my set up. my question is what all would need changed, I assume a bellhousing for a Mack trans would be needed and some driveshaft work as well. Is there a yoke that would work that has the 16 tooth ring for speed sensor? Are there any software adjustments I could make to optimize this set up ? i realize I may have to fabricate a mount for the sensor . thanks in advance for any info

Is there different software files for the automatic versus manual transmission for the AMI 370 ?

This is some great info !!

I had my AI 350 upgraded with the AMI 370 file, it’s a pure joy to drive now. Always liked the idea of less shifts with the 6 speed trans.

I wonder how the AMI 370 would respond with the 5 and 6 speeds that was used with the old maxidynes of the 70’s and 80’s The AMI has a similar rpm band as the old maxidyne did... just a thought

I’ve been reading this post with tons of interest since I am considering a swap to the 750 DRD in my 03 RD 688S tri axle dump how do these trucks perform off road compared to a similarly equipped truck with a 8LL ? my truck has the 8LL and 4.42:1 ratio, I realize this would limit my top end speed, most of my work is local stone delivery and site work with a little highway driving and most of that in a 55 mph speed zone. I did reflash my ECM with the AMI 370 software that moves my max rpm from 1950 up to 2150 However I’m not sure I want to run down the road at 2100 rpm to run 55 ish mph also thought about the auxiliary trans route to get overdrive but was told I would have issue shifting that since I wouldn’t have a clutch. i am looking to you guys for some real world experience to help with making the leap.

I’ve been reading this post with tons of interest since I am considering a swap to the 750 DRD in my 03 RD 688S tri axle dump how do these trucks perform off road compared to a similarly equipped truck with a 8LL ? my truck has the 8LL and 4.42:1 ratio, I realize this would limit my top end speed, most of my work is local stone delivery and site work with a little highway driving and most of that in a 55 mph speed zone. I did reflash my ECM with the AMI 370 software that moves my max rpm from 1950 up to 2150 However I’m not sure I want to run down the road at 2100 rpm to run 55 ish mph also thought about the auxiliary trans route to get overdrive but was told I would have issue shifting that since I wouldn’t have a clutch. i am looking to you guys for some real world experience to help with making the leap.