Xtreme Performance Transmissions?

Hello all, I've done a search here but nothing came up on this company. The short version is this: SPPrecision.com is having a sale and their XP1 4L65e transmission is just over $2k with a new "performance" converter. People over at LS1Tech.com as well as PerformanceTrucks.com have great things to say, and even Cunningham Motorsports uses their automatics though they build their own manual boxes... at least that was the case when the thread was made. I've emailed the company with questions regarding other performance levels, core trade ins, and the included converter. Their 4L80 is on sale too....







Does anyone here have personal experience with this company and their transmissions? Maybe a friend has one?

My other choice is an RPM Transmission and Speed Inc has the "Level 4" at $2,500. RPM builds excellent units but I'm enticed by the XP1 so any and all input is appreciated.



I've got a 4L65e core and tons of performance parts for it to go in my '04 Sierra but a direct bolt-in would be much quicker and avoid confusion with the builder: my trans mods would require a $600 DiabLew tune for the truck, and it would be a cinch to go full manual with it the Cutlass or El Camino instead. I'm considering buying one for the truck that won't require a tune but could use one later, and saving what I've got. Thoughts?

Keeping in mind that "Levels" listed are just sales jargon and equate to nothing, as the parts are what counts.

Nothing, huh? I'll report back when they respond to my email.

I hadn't either until now, and there are multiple bad reviews but those sound like they're for a general mechanic shop, not a transmission remanufacturer. Their lack of response to my email doesn't bode well though, and the ambiguous wording on their website gives me pause.