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Old 02-02-2016, 08:19 PM   #43
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Re: 4L80E & TH400 Tech.

Originally Posted by aggie91 View Post
Great information here. Bookmarked for future use...

One question on "Pressure Regulator & Boost Valve basics, From a Sonnax Tech article"
Is it better to just do the Boost Valve size increase?
When running a large ratio Boost Valve, The Pressure Regulator Spring cannot be over 15% stronger than the OE Spring....Anymore than that, Problems will surface particularly on the 4L80E.

Sonnax has Line Booster kits for both units that come with a Boost Valve & a 10% over PR spring.

TH400 part# 400-LB1
4L80E part# 4L80E-LB1
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