123 126 Diesel Transmission Ultimate Diagnostic and Tuning Kit

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116 and 126 1978 to 1984 300SD, 1980 to 1984 123 240D and 1981 to 1985 123 Turbo 300D 300TD 300D 300CD. Does not apply to the 722.4 transmissions found in most 1985 models

INCLUDES TRANSMISSION PEAK TUNING MANUAL. DO NOT ORDER SEPARATELY

123 126 Diesel Transmission Ultimate Diagnostic and Tuning Kit
$128.50
SKU:
TRS-123ATUTK
Free Add-Ons Included:

Troubleshooting Older Diesel Automatic Transmission Shift Problems - On Demand Video

How to Test the VCV ( Vacuum Control Valve ) for Proper Operation - On Demand Video

Product Details

Can tuning really make a different. You must watch this video!

To properly tune your diesel transmission you will first need the know-how and then the equipment to adjust your transmission modulator and your VCV transmission shift valve. This Kit will cover models 116 and 126 1978 to 1984 300SD, 1980 to 1984 123 240D and 1981 to 1984 123 Turbo 300D 300TD 300D 300CD. For those of you who have the 1985 model the vacuum modulator test and the VCV tester will work, but the book does not have specific information on fine tuning the vacuum system on the 1985 722.4 transmission. 

Kit includes all items listed below. To read more about each individual book / kits you can go directly to the product links below.

  • Kent's full length Transmission PEAK tuning manual on vacuum transmission testing and adjustment. 
  • Mercedes Diesel Automatic Transmission VCV Vacuum Controls Testing Kit
  • Mercedes 61x Diesel Automatic Transmission Modulating Pressure Test Kit
  • INCLUDED FOR FREE WITH PURCHASE:
  • Troubleshooting Older Diesel Automatic Transmission Shift Problems - On Demand Video
  • How to Test the VCV ( Vacuum Control Valve ) for Proper Operation - On Demand Video
Troubleshooting an annoying shift problem must first start with the vacuum modulator. This vacuum control unit mounted on the side of the transmission must be tested and adjusted to specs BEFORE you move on to other adjustments.

PLEASE NOTE: You will need a hand held vacuum pump tester to perform the diagnostics with this kit. If you do not already own one, We do sell the vacuum pump tester separately look below to view!

Related Products:

61x Diesel Automatic Transmission Tuning Manual
$28.50

Diesel Automatic Transmission PEAK Performance Tuning Manual by Kent Bergsma

Receive two related On-Demand videos FREE! Covers ALL Diesel Automatics from 1969-1984 220D 240D 300D 300CD 300TD 300SD

I have received so many emails on this topic that I had to sit down and write a very detailed manual over 130 pages in length!  Let's face it! Diesel automatic transmissions can be troublesome, particularly those models that use vacuum to control shifts.

$38.95

Diesel Automatic Transmission VCV Vacuum Controls Testing Kit

All diesel Automatic Transmissions with Vacuum Modulator Fitted 1978 to 1993

This unique kit will allow you to hook up a 30 in HG vacuum gauge between your vacuum control shifting valve (VCV) and your transmission modulator to test the VCV for proper function and to tune it for peak shifting performance.